The water level in the gauge glass when a boiler is operatin

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[单选题]The water level in the gauge glass when a boiler is operating is _____ when the boiler is shut down.

A. lower than
B. higher than
C. below
D. equal to

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[单选题]典型霍乱起病突然，剧烈呕吐、腹泻，大便呈______。

A. 典型脓血便
B. 柏油样大便
C. 水样、米汤样大便
D. 粘液脓血便

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