机组反飞动阀打开以后可以降低出口压力
参考答案:对
生产力发展水平只是制约着教育事业发展的规模和速度,并没有制约教育内部的结构。
27. He gave in to ______and opened the letter addressed to his sister.
A.curiosity
B.feeling
C.worry
D.hope