The emergency generator or emergency battery is connected to（） on most large ships.
A. distribution boards
B. section boards
C. emergency switch boards
D. main switch board
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清算交换票据磁码域交易码2位，其中人民币借记退票代码为（）。
A. 00
B. 01
C. 04
D. 09
（） may be the first possible cause which makes the engine to lose power or slow down when it is running.
A. Hot bearing
B. Starting valves
C. Unequal distribution of load
D. Excessive crankshaft clearance
当用氩弧焊、等离子弧切割等工艺时，为减少放射性的危害，应当选用的电极是（）
A. 纯钨棒
B. 铈钨棒
C. 钍钨棒
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