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【单选题】
设两平行直线a、b间距离为20cm，平面α与a、b都平行且与a、b的距离均为10cm，则这样的平面α有（ ）A.
4个
B.
3个
C.
2个
D.
1个
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【简答题】I have written to
my pen pal (笔友) and now I’m ______ his letter. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> (2.0分)A. looking
for B. looking
after C. looking
forward to D. ...
【简答题】I have written to her because she phoned me shortly afterwards. (couldn't, needn't)A. needn't
【单选题】I have written to my pen pal and now I’m ___his letter
A.
looking for
B.
looking after
C.
looking forward to
D.
looking up
【单选题】I have written to her because she phoned me shortly afterwards. (couldn't, needn't)
A.
couldn't
B.
needn't
【单选题】( ) your address, I would have written to you.
A.
Did I know
B.
Were I to know
C.
Had I known
D.
If I should know
【单选题】I have written to______the invitation.
A.
admit
B.
accept
C.
acceptance
D.
acceptable
【简答题】工程机械电源系统由 、 、 、 相关线路等组成。
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