12-P-160入缓冲器的胶囊,使其压力保持在10psi左右、排出空气包压力是()。
参考答案:泵工作压力的1/3
Mum wants to make a cake. She needs _____ some eggs. [ ]
A. buy
B. buys
C. to buy
D. buying
外网指的是()
A.非受信网络
B.受信网络
C.防火墙内的网络
D.局域网