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【单选题】
采用串联超前校正时，通常可使校正后系统的截止频率【图片】（ ）。A.
减小
B.
不变
C.
增大
D.
可能增大，也可能减小
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皮皮学刷刷变学霸
举一反三
【单选题】-- Be careful as you step down. -- __________.
A.
Thank you.
B.
That’s very kind of you.
C.
Sorry.
D.
I don’t know.
【单选题】As an engineer, you can't be careful. You should pay attention to every detail.
A.
very
B.
too
C.
so
D.
quite
【单选题】Be careful when you deal with this chemical, as it will explode when _____ to sunlight. [ ]
A.
being exposed
B.
to expose
C.
exposing
D.
exposed
【单选题】The UN must do something before the war _______beyond control.
A.
escalated into
B.
escalated
【单选题】Be careful when you watch the painting as it is______.
A.
valueless
B.
priceless
C.
costless
D.
worthless
【单选题】Be careful when you deal with this chemical, as it will explode when ______ to sunlight.
A.
exposed
B.
to expose
C.
exposing
D.
being exposed
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