船舶安全网要严格按要求设置，无论舷梯、桥梯与码头成（），安全网的上缘都应系在本船上，下缘系在码头上。
A、钝角
B、直角
C、平行
D、B或C
参考答案：D
President Nicolas Sarkozy of France has been taking intensive English lessons in order to _____ his guests during his state visit to the UK.
A．appeal
B．grasp
C．hold
D．impress
厌氧菌培养的标本送到实验室后处理最迟应不超过（）。
A.30min
B.1h
C.2h
D.3h
E.12h
