The time of discharging oil is short, but oily water separator discharges oil frequentlyThe possible reason is （）
A. the sensor of low oil level is fully covered by sludge
B. the coarse strainer before the pump in suction system is clogged
C. the screw pump is worn seriously and volumetric efficiency is decreased
D. bilge suction value is clogged
汽车下坡起步，在一般平缓坡道起步，可按平路起步要领操作。坡道较陡时，可用（）起步。
A. 一挡或二挡
B. 二挡或三挡
C. 三挡或四挡
D. 四挡或五挡
因特定工作需要而临时开放的一些用户，用户/运维管理员可以在该项工作完成后即刻修改该临时用户的帐户密码，并对密码修改情况做好记录。
A. 正确
B. 错误
We can（）wait to hear the news.
A. rarely
B. hardly
C. nearly
D. seldom
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