“视觉悬崖”是用于测查（）
A、大小知觉
B、时间知觉
C、深度知觉
D、形状知觉
参考答案：C
—Jack, would you like to go to the cinema with me this evening?
— ______
—I asked if you would like to go to the cinema with me this evening?
A．Sorry?
B．Excuse me．
C．I’m afraid not．
D．Sorry, I can’t decide yet.
航速为14～23kn的航行船，AIS船舶报告的频度为（）；当其改向时，报告的频度为（）。
A、每12s，每6s
B、每3s，每2s
C、每6s，每2s
D、每12s，每4s
