When one of two vessels()is required to keep out of the way the other must keep her course and speed.
A. In sight of another
B. Sights the another
C. Not in sight of the other
D. In sight of one another
电流损失是配电线路选择导线截面的首要条件。
A. 正确
B. 错误
Sludge formation in a diesel engine lube oil system is caused by()
A. carbonization of oils from the combustion chambers
B. emulsions of lube oil and water
C. coagulation of unburned fuel below the piston rings
D. all of the above
下面对音位的叙述正确的是()。
A. 音位是某一语言中能区分词的语音形式的最小语音单位
B. 音位是从语音的社会属性角度划分出来的最小语音单位
C. 属于同一音位的音素彼此没有区别意义的作用
D. 每一种语言都有自己的一套音位系统