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【单选题】
某塔高30m,进行水压试验时,离塔底10m高处的压力表读书为500kPa(塔外大气压力为100kPa),那么塔顶处水的压力为()A.
403.8kPa
B.
698.1kPa
C.
600kPa
D.
无法确定
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【单选题】当前已打开Word文档l,苦想再打开Word文档2，则_____
A.
必须先关闭文档l，才能打开文档2
B.
打开文档2时，自动关闭文档1
C.
可直接打开文档2，不必关闭文档l
D.
文档2的内容自动加入文档1中
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