A stopper used in securing the ground tackle for sea that consists of a grab attached to a
A. riding pawl
B. buckler
C. devil’s claw
D. locking ring
查看答案
The word “breadth of a vessel” in International Regulations for Preventing Collision at Sea 1972 means ______.
A. The molded breadth
B. The registered breadth
C. The breadth amidships
D. The maximum breadth
对于低压配电网,配电容量在100KW以下时,设备保护接地的接地电阻不应该超过()。
电气火灾发生时应先切断电源再扑火,但不知或不清楚开关在何处时,应剪断电线剪切时要()。
电气火灾的引发时由于危险温度的存在,危险温度的引发主要是由于()。