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【单选题】
下列装置中当电梯的供电系统中出现断,电气系统能自动停车,以免造成电动机过热或烧坏。当电梯电源系统出现错,电梯的电气电梯维保能自动停止供电,以防止电梯电动机反转造成危险的是A.
供电系统继相、错相保护装置
B.
超越上、下极限工作位置的保护装置
C.
层门锁与轿门电气联锁装置
D.
慢速移动轿厢装置
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举一反三
【单选题】Stow the derricks （）before sailing.
A.
fore and aft
B.
up and down
C.
port and starboard
D.
left and right
【单选题】Before Chichester began his sailing, he was
A.
a businessman
B.
a pilot
C.
a teacher
D.
a doctor
【简答题】One hour before sailing, the duty engineer and officer should check ______A. Tachometer and engine telegraph B. oil and water reserves C. clock and engine telegraph and test the rudder D. D. crews
【单选题】Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with ______.
A.
ship's clock
B.
engine movement recorder
C.
repeaters
D.
navigation lights
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