“二战”后，在高新科技推动下，世界经济呈现出的趋势是[ ]
A．全球化
B．多极化
C．一超多强
D．两极并立
答案：A
If your vessel is equipped with inflatable liferafts，how should they be maintained?（）
A.Have your crew check them annually
B.They do not need any maintenance
C.Have them sent ashore to an approved maintenance facility annually
D.Have them serviced by the shipyard annually
调整切丝机喂料装置的布料板，使烟料在料仓中分布均匀，调整推料板摆幅和初始位置，（），可防止切丝跑片。
A.增加摆动频率
B.减少摆动频率
C.减少摆动幅度
D.减少摆动角度
