裂解气深冷分离过程中,脱除炔烃常用催化加氢法。
参考答案:对
输油泵不供油或供油中断主要原因可能是顶杆或活塞卡住,活塞弹簧折断。
I saw a woman running toward me in the dark. Before I could recognize who she was, she had run back
in the direction _ she had come. [ ]
A. of which
B. by which
C. in which
D. from which