问题
单项选择题
The hydrostatic release on the inflatable liferafts on a fishing vessel must be（）.
A.replaced annually
B.tested monthly
C.serviced annually
D.overhauled quarterly
答案
参考答案：C
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The hydrostatic release on the inflatable liferafts on a fishing vessel must be（）.
A.replaced annually
B.tested monthly
C.serviced annually
D.overhauled quarterly
参考答案：C