Upon the completion of required tests, a ____ should be plac

【名词&注释】

平滑肌(smooth muscle)、救生圈(buoy)

[单选题]Upon the completion of required tests, a ____ should be placed on each extinguisher, showing the date and the person who completed the tests.

A. cap
B. disc
C. tag
D. cover

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举一反三：

[单选题]非随意肌也称平滑肌，分布在______。

A. 头部、颈部、胸部、腹壁
B. 胃、肠、心脏、血管
C. 胸部、后背、四肢、腹壁
D. 头部、颈部、后背、四肢

[单选题]备有可浮救生索的救生圈，船舶每舷至少应有：

A. 1个
B. 2个
C. A与B都对
D. A与B都不对

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