裂解汽油加氢装置预分馏系统较长时间离心泵不上量时，在操作上，应尽可能防止满塔或空罐。
参考答案：对
以下哪项不是创口的局部表现（）。
A.疼痛
B.功能障碍
C.肿胀
D.体温升高
E.充血
More and more students lost interest in his class, which ________ him very much.
A．teased
B．terrified
C．frightened
D．depressed
