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控制系统按有无反馈分为（）和（）。
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【简答题】(2013·天津，11)It was not until near the end of the letter________she mentioned her own plan. A．that B．where C．why D．when
【单选题】It was not until near the end of the letter ____ she mentioned her own plan.
A.
that
B.
where
C.
why
D.
when
【单选题】It was not until near the end of the letter ______ she mentioned her own plan.
A.
where
B.
that
C.
why
D.
when
【单选题】Which of the following was NOT mentioned by Susan when she talked about her personal rewards?
A.
Her project changed parents' attitude towards the Internet.
B.
Her projects have had a positive impact.
C.
A class in Canada purchased computers because they were eager to be on her project.
D.
She got to collaborate with a lot of talented teachers.
【简答题】水泥在贮运过程中,会吸收空气中的 和 ,逐渐出现 现象,使水泥丧失 —— ,因此贮运水泥时应注意 ——
【单选题】How old will she be if she makes the 2012 Olympics?
A.
34.
B.
38.
C.
28.
D.
Her age not mentioned.
【简答题】水泥在贮运过程中,会吸收空气中的 和 ,逐渐出现 现象,使水泥丧失 ,因此贮运水泥时应注意 。
【单选题】(2013·高考天津卷)It was not until near the end of the letter ________ she mentioned her own plan.
A.
that
B.
where
C.
why
D.
when
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