单项选择题

压强为p、体积为V的氢气（视为刚性分子理想气体）的内能为（）。 A.
B.
C.
D.

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单项选择题
28.Now the pollution caused by the increasing number of cars ___________more and more serious in many cities. A.
A)become
B.
B)became
C.
C)is becoming
D.
D)had become
不定项选择
On container ships, cargoes care carried in standardized measurement.
A．正确
B．错误