单项选择题利用蒸汽和凝水的密度不同,形成凝水液位,以控制凝水排水孔自动启闭工作的是()。
A热静力型疏水器
B热动力型疏水器
C机械型疏水器
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4.单项选择题()to say a thing in that way
A、It is considers wrong
B、It is considered wrong
C、It is considered it's wrong
D、It is consiedring wrong
6.单项选择题Great changes()in our province.Many tall buildings.
A、have been taken place, have been set up
B、have taken place, have been set up
C、have been taken place, have been set up
D、were taken place, were set up
8.单项选择题Hardly () I think it possible.
A、had
B、did
10.判断题保育员应当及时本班的疾病防治工作。()
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