单项选择题
The vapor pressure of a substance（）.
A.decreases as temperature increases B.increases with the temperature C.is not affected by temperature D.may increase or decrease as the temperature rises
单项选择题 The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.
单项选择题 The tops of vents from gasoline tanks should terminate（）.
单项选择题 The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.
