正确答案: B

触之空虚

题目：关节脱位处()

解析：B

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学习资料的答案和解析：

[单选题]GMDSS的通信资费类型是_____。

免费与商业资费

[单选题]The class of fire on which a blanketing effect is essential to extinguish the fire is

Class 'B'