正确答案: C

不规则骨

题目：椎骨是哪类骨?( )

解析：C

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举一反三的答案和解析：

[单选题]Each cylinder is closed at the top by a _____, made of a special heat-resistant steel.

cylinder cover

[单选题]Please arrange for ________ to clean the holds before my vessel takes cereal

cleaning gangs