题目:
If your passenger vessel is fitted with a loudspeaker system,it must be tested at least once ().
A.every week
B.a day
C.every trip
D.a watch or once a trip,whichever is shorter
答案:
参考答案:A
If your passenger vessel is fitted with a loudspeaker system,it must be tested at least once ().
A.every week
B.a day
C.every trip
D.a watch or once a trip,whichever is shorter
参考答案:A