当交流主供电（ACESSFEED）按钮松出时（ALTN位），飞机电网的正常供电如何变化（）
A. 交流主汇流条由应急交流发电机供电；
B. 交流主汇流条由交流汇流条1供电；
C. 交流主汇流条由交流汇流条2供电。
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中线复测过程中如发现设计中长线长度大量错误或需局部改线时，应做如何处理？
银行承兑汇票签发的前提（）。
A. 开立对公客户号
B. 开立存款帐户
C. 开立保证金账户
D. 开立贷款帐号
Which statement is true concerning a vessel equipped with operational radar?（）.
A. The Master of the vessel must be on the bridge when the radar is in use
B. The radar equipment is only required to be used in restricted visibility
C. The use of a radar excuses a vessel from the need of a look-out
D. This equipment must be used to obtain early warning of risk of collisio
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