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【单选题】
当轮系运转时,所有齿轮几何轴线的位置相对于机架固定不变的轮系称为A.
轮系
B.
转轮系
C.
混合轮系
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反馈参考答案：
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】The UN must do something before the war _______ beyond control.
A.
escalated
B.
appoved
C.
represented
D.
justified
【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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