氨吸收浅冷装置精馏塔塔底液位下降并鼓出大泡应迅速（）阀门。
A.关小加热蒸汽
B.开大加热蒸汽
C.开大塔底稀氨水出口
D.开大塔顶冷却水进口
参考答案：A
The athlete fell off his bike when he _____ down the hill. [ ]
A. cycled
B. was cycling
C. had cycled
D. is cycling
党的地方各级纪检机关在同级党委和（）的双重领导下进行工作。
