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Yin Zhuo, an information expert in the PLA Navy, said the carrier will not change the defensive nature of China's defense force.

"A shortage of teachers who know the topic well is a major bottleneck," he said. "It is even difficult for us to find competent scholars to provide professional training for the teachers."

In breakdown, the profits of centrally administered SOEs slid 10.4 percent from a year earlier to 695.21 billion yuan January-June, while SOEs under local governments saw profits decrease 13.9 percent to 325.16 billion yuan.

The purchasing managers index (PMI), a readout of China's manufacturing activity, ended five consecutive months of growth last month and retreated to 50.4 percent from 53.3 percent in April, the China Federation of Logistics and Purchasing said Friday.

The spokesman said the nation aims to close another 625 small coal mines this year in an attempt to reduce the number of deadly accidents.