听力原文:(A) The travelers are checking in for their flight.
(B) The passengers are passing through security.
(C) The baggage handlers are weighing the bags.
(D) The tourists are boarding the train.
A.
B.
C.
D.
第5题
某多轴电机有2208字样,意思是指()
A.该电机转子周长为22毫米
B.该电机转子高度为22毫米
C.该电机转子直径为22毫米
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