除中
参考答案:久病之人,本不能食,突然欲食,甚至暴食,是脾胃之气将绝之象。
It is well known that knowledge is ____ treasure house, but practice is ___ key to it.
A.a; the
B.the; the
C.a; x
D.x; the
闸阀的()是关键部件,它决定闸阀的工作性能、密封性能和使用寿命。
A、阀体
B、阀盖
C、阀杆
D、闸板