安庆头针灸模型20CM河南高级出生婴儿附脐带模型,南昌超声诊断虚拟教学系统,济南肩膝关节综合手术实训系统（显影版）,山西接生示教模型,银川透明头颅骨模型,河池儿童纵隔模型,骨发生模型价格

The massacre of 26 worshipers at a rural Texas church is the latest in a grisly series of mass shootings across America in recent years.With each tragedy, we hear arguments about gun violence, mental health, how much firearms should be regulated and what’s driving the prevalence of mass shootings. PolitiFact has worked for years to research these topics to help explain talking points used by all sides of the debate.Here are some answers to some questions you may have.How do we define mass shootings?There is no widely accepted definition of mass shootings. People use either broad or restrictive definitions of mass shootings to reinforce their stance on gun control.Researchers at the nonpartisan Congressional Research Service defined "mass shooting" as "a multiple homicide incident in which four or more victims are murdered with firearms, within one event, and in one or more locations in close proximity" in a 2015 report. They counted 317 mass shootings from 1999-2013.The report also used the term "mass public shooting" for a multiple homicide incident in which four or more victims are murdered with firearms, within one event, in at least one or more public locations, such as a workplace, school or house of worship. There were 66 attacks that met that definition during that 15-year period.After the 2012 Sandy Hook school shooting, Congress defined "mass killings" as three or more homicides in a single incident. The definition was intended to clarify when the U.S. Attorney General could assist state and local authorities in investigations of violent acts and shootings in places of public use.The Gun Violence Archive tracks gun deaths using media, law enforcement, government and commercial sources. Its data is based on a broader criteria: at least four people injured or killed in one location, not including the suspect. Criminologists previously told?PolitiFact that this group’s tally includes gang shootings and home invasion robberies.When is a mass shooting in the United States considered terrorism?A mass shooting needs to meet several criteria in order to be legally labeled as domestic terrorism. That definition applies to acts dangerous to human life that are a violation of U.S. or state criminal laws, which occur primarily within U.S. territorial jurisdiction and appear to be intended to: 2388

The Michigan Department of Transportation says 40-50 cars and semis have been involved in an accident on I-94 in Jackson County, located about 80 miles west of Detroit.According to an MDOT traffic map, the crash appears to be on Westbound I-94 at Race Rd., exit 147 between Ann Arbor and Jackson.Three people reportedly suffered minor injuries in the pileup.According to the Jackson County Sheriff's Office, Michigan State Police, the Jackson County Sheriff's Office and Blackman-Leoni Public Safety are responding to the crash scene.Westbound I-94 is currently closed at the accident site.   610

The head of OPEC has warned that a decision by President Donald Trump to abandon the Iran nuclear deal would harm the global economy.In an interview with CNNMoney, OPEC Secretary General Mohammad Barkindo said that any factor that prevents the smooth running of the oil industry "will not be in the interest of the global economy.""Whatever extraneous factor that affects supply or demand, will no doubt send the market into disequilibrium, which is not in the interest of producers, or the interest of consumers," he said when asked about the consequences of ditching the Iran nuclear agreement.Trump has repeatedly threatened to rip up the Iran accord, which he has described as "the worst deal ever." He said he plans to announce his decision on the matter on Tuesday at 2:00 p.m. ET.The United States and other powers agreed to lift some economic sanctions under the 2015 deal in return for Iran agreeing to rein in its nuclear program. The sanctions had limited energy investment and production, and Iran's oil industry has sprung back to life since they were lifted.Iranian oil exports have increased by roughly 1 million barrels per day since early 2016, and the big question is whether the market will be able to cope with a sharp drop in supply if sanctions are reimposed.Worries over potential supply disruptions have already caused oil prices to spike. They've surged nearly 13% over the past month and hit their highest level since 2014, while the price of US gas has jumped to a national average of .81 a gallon.Barkindo said that price hikes were being driven by "volatility that occasionally returns to the market" as a result of "geopolitical tensions."A Nigerian who is serving a three-year term as secretary general, Barkindo said that OPEC would continue to seek a balanced oil market. The interview was conducted before Trump said an announcement on Iran was imminent.The cartel and its allies agreed to slash output in late 2016, a response to oversupply and an oil price crash. The agreement has been extended until the end of 2018.The secretary general said it had taken four "long" years for OPEC to get where it is today, with prices hovering around .Barkindo said the cartel was committed to seeing the agreement through, but he hinted that market conditions could spur a change."We have always been flexible. There is nothing sacrosanct in this market," Barkindo said.  2414

The Ketogenic, or Keto Diet, seems to be one of the latest diet fads. The diet requires cutting carbs, opting for healthy natural fats, meat, fruits with very little sugar and lots of vegetables that are grown above ground.The menu helps your liver produce something called "ketones" instead of blood sugar. Those ketones burn fat at a much faster rate. 366

The number of people still unaccounted for following the devastating Camp Fire in northern California has dropped to 25, the Butte County Sheriff's Office said.The latest count is down from a one-time high of more than 1,000 people.The death toll remained at 88 on Saturday, with no further remains found, the sheriff's office said in a tweet.The Camp Fire burned through more than 153,000 acres in Butte County after it broke out November 8. It was contained November 25 after becoming the deadliest and most destructive wildfire in California history.The blaze decimated much of the town of Paradise and destroyed nearly 14,000 homes and more than 4,800 other buildings. 680