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【单选题】
旋风分离器的总分离效率是指( )A.
颗粒群中具有平均直径的粒子的分离效率
B.
颗粒群中最小粒子的分离效率
C.
不同粒级（直径范围）粒子分离效率之和
D.
全部颗粒中被分离下来的部分所占的质量分率
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举一反三
【单选题】Not only _____ a promise, but also he kept it.
A.
he made
B.
did he make
C.
does he make
D.
has he made
【简答题】A．He was a foreigner. B．The spokesman made adverse remarks. C．He made false reports. D．He committed crime.
【简答题】He not only made a ______( 允诺 )but also he kept it.
【单选题】He often made his sister ______, but this time he was made ______ by his sister.
A.
cry; to cry
B.
cry; cry
C.
to cry; cry
D.
to cry; to cry
【单选题】After saying that, he ______ the door quickly.
A.
made up
B.
made for
C.
made out
D.
made
【简答题】A．He did not fight in the Revolution my War. B．He did not really exist. C．He was an important town leader. D．He was not the only messenger.
【单选题】_____________ that he did quite well in the exam.
A.
He made so rapid progress
B.
He made so rapid a progress
C.
His English made such rapid progress
D.
He made such rapid progress.
【单选题】The sudden rain made _______ for the singers to put on performances. [ ]
A.
that possible
B.
that impossible
C.
it possible
D.
it impossible
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