侧架、摇枕、车钩、钩尾框、钩舌、交叉杆、制动梁,以上实施换件修配件,站修储备存放时间不得超过()。
A. 3个月
B. 半年
C. 一年
D. 1.5年
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On your vessel,a wire rope for the cargo gear shows signs of excessive wear and must be replaced. In ordering a new wire for this 10-ton boom,what safety factor should you use?()
A. Three
B. Five
C. Six
D. Seve
游标卡尺的测量范围是()。
A. 0~100mm
B. 0~200mm
C. 0~300mm
D. 0~500mm