保持标准转弯率从090°航向向左转到300°需要多长时间（）.
A.30秒钟
B.40秒钟
C.50秒钟
参考答案：C
— What can I do for you, sir?
— I'd like to see the manager _____ of sales department. [ ]
A. in the charge
B. under charge
C. is in charge
D. in charge
如何确保已搭设部分构架的稳定？
