当提高()等均不能使加氢产品合格时,加氢反应催化剂就应再生。
A.出口温度或氢炔比
B.入口温度或氢炔比
参考答案:B
对产力的描述不正确的是 ()
A.包括子宫收缩力和腹肌、膈肌和肛提肌收缩力
B.子宫收缩力的缩复作用使宫腔变小
C.子宫收缩力贯穿于分娩全过程
D.肛提肌收缩能使胎先露完成内旋转动作
E.临产后子宫收缩力由弱到强
Although many modifications have been made in it, the game known in the United States as football can be traced directly to the English game of rugby.
A.rules
B.changes
C.demands
D.leagues