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【单选题】
三个容积完全相等的容器，联接如图示，先将阀门a,b关闭，阀门c开启。压强计p指示为0。将容器I充入压缩空气，绝对压强为300KPa，容器Ⅲ抽成真空度为30KPa。先关闭阀门c,再开启阀门a和b。这时，压强计p的读数应该是(设当地大气压是100KPa)（）
A.
56.7KPa
B.
76.7KPa
C.
90.0KPa
D.
110.0Kpa
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A.
All of them were caught and put back to prison.
B.
All of them were caught and were killed right away.
C.
The five missing prisoners were eventually found.
D.
The five missing prisoners were assumed to have died.
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