吸、排气阀漏气造成活塞式压缩机打气量不足的处理措施是检查吸、排气阀，必要时进行更换。
参考答案：对
After studying in a medical college for five years, John _______ her job as a doctor in the countryside.
A．set out
B．took up
C．set up
D．set off
20mL1mol/LH2SO4溶液加入到另一种20mL1mol/LH2SO4溶液中，则混合液浓度为2mol/L。
