推进液的注油、排油阀为气闭阀，要始终维持一定的空气压力，两阀的最小动作压力不低于（）MPa。
参考答案：0.4
一袋大米，吃了18千克，还剩32千克，吃了这袋大米的百分之几？
The young parents _________ too much a pet of their son, which is bound to destroy him in the end.
A．have made
B．are making
C．made
D．will be making
