2016年加快3升4进度，移动用户净增1200万，4G渗透率达（）
A. 60%
B. 80%
C. 90%
D. 100%
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Which of the routine maintenance procedure listed is required for starting air receivers?（）
A. Frequent draining of accumulated moisture
B. Frequent testing of relief valves
C. A close watch on temperature to prevent fluctuations in pressure
D. Frequent cleaning to re move oil and foreign matter
在Word中，移动表示从某一位置复制选择的文字或图形，然后粘贴到另一位置。
A. 正确
B. 错误
What is TRUE when operating in fog and other vessels are detected by radar?（）.
A. You should make an ample change to port for a vessel crossing on the starboard bow
B. You should maneuver in ample time if a close-quarters situation is developing
C. You should determine the course and speed of all radar contacts at six minute intervals
D. Long-range scanning will provide early warning of ALL other vessels within the radar's range
We have to point out that the postponement of the fulfilment of the contract（）caused us certain expenses.
A. had
B. have
C. has
D. having
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