题目：
A lifeboat is weight tested by lowering to near the waterand loading to capacity with weight evenly distributed. Itis then lowered into the water and released. This test mustbe done at least once every（）.
A.6 months
B.12 months
C.18 months
D.24 months
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对
