单项选择题
A.to B.on C.of D.for
A.urgency or an emergency B.the vessel's national identity signal C.a group from the general signal code D.a group from the medical signal code
A.Hard rubber B.Canvas C.Leather D.Sponge rubber
A.at the lowest point B.near the batteries C.at the highest point D.only when charging is in progress
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