有一水泵装置,其吸水管中某点的真空压强等于 3 m 水柱高,当地大气压为一个工程大气压,其相应的绝对压强值等于( )
A.
3 m 水柱高
B.
7 m 水柱高
C.
-3 m 水柱高
D.
其余答案都不对
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