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Barriers include "the limitations of materials science; the high costs of 3D printing compared with the costs of traditional manufacturing processes such as injection molding, casting or milling; quality concerns; and the (low level of) acceptance by healthcare providers, payers, and patients".

Barriers to growth for the e-cigarette industry in China include the relative cost of products when compared to tobacco, and lack of availability of products in bricks-and-mortar stores. Around 80 percent of e-cigarette sales in China occur online, according to Research and Markets.

Battery swap technology solves this problem. At BJEV's battery swap stations, vehicles can get their empty batteries replaced by fully-charged ones within 90 seconds.

Barr was asked specifically about the report's finding that in June 2017 Trump directed White House counsel Don McGahn to tell the Justice Department's No. 2 official, Rod Rosenstein, that Mueller had conflicts of interest and must be removed. McGahn did not carry out the order. Rosenstein had appointed Mueller the prior month.

Baihang focused on rating consumer credit information by nonbank finance providers, such as online peer-to-peer lending platforms.