+24伏电源系统第2次下电的电压值,应设定为()。
A. 24.0伏
B. 23.0伏
C. 21.6伏
D. 19.0伏
查看答案
食盐中水分测定双试验误差为()。
A. 0.3%
B. 0.05%
C. 0.2%
D. 0.10%
机泵的()损坏,会导致机泵振动。
A. 阀门手轮
B. 对轮罩
C. 密封
D. 轴承
We()our breakfast when the pilot came on board.
A. just have had
B. just had
C. have just had
D. had just had