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燃烧物质是指与酸接触会产生可燃气体,同时放出高热,该热量就能引起可燃气体着火爆炸的物质。下列物质属于燃烧的是:
A.
碳化钙（电石）
B.
碳酸钙
C.
锌
D.
硝化棉
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【单选题】干热敷比湿热敷的穿透力( )
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查看完整题目与答案
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排它锁又称为X锁或写锁
B.
共享锁与任何锁都相容
C.
强两阶段封锁协议要求事务提交之前不得释放任何锁
D.
封锁自身产生的主要问题是死锁
查看完整题目与答案