A vessel having continuous closely spaced transverse strength members is（）.
A. longitudinally framed
B. transversely framed
C. cellular framed
D. web framed
查看答案
A cofferdam is（）.
A. any deck below the main deck and above the lowest deck
B. a member that gives fore-and-aft strength
C. made by placing two bulkheads a few feet apart
D. a heavy fore-and-aft beam under the deck
电磁式计程仪的传感器把船舶相对于水的速度转化成电信号，它的原理是（）。
A. 利用水流切割磁力线产生电动势，作为船速信号
B. 利用传感器发射超声波的多普勒频移，作为船速信号
C. 利用传感器发射电磁波的多普勒频移，作为船速信号
D. 利用换能器检测船速信号的延时
微信支付 
支付宝支付