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【单选题】
某塔高30m,进行水压试验时,离塔底10m高处的压力表的读数为500kPa,(塔外大气压强为100kPa)。那么塔顶处水的绝对压强为( )。
A.
403.8KPa；
B.
698.1KPa；
C.
600KPa；
D.
无法确定。
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