正确答案: C

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题目：Upon the completion of required tests, a ____ should be placed on each extinguisher, showing the date and the person who completed the tests.

解析：C

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举一反三的答案和解析：

[单选题]非随意肌也称平滑肌，分布在______。

胃、肠、心脏、血管

[单选题]备有可浮救生索的救生圈，船舶每舷至少应有：

1个