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【单选题】
下列关于蒸馏实验的说法正确的是( )A.
冷凝水上进下出
B.
具有恒定沸点的液体都是纯化合物
C.
纯化合物的沸点通常在5~8 o C
D.
当待蒸馏液体沸点在140 o C以上时，空气冷凝管
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反馈参考答案：
举一反三
【单选题】She ______ in New Zealand for years till now since she was very young.
A.
lives
B.
has been living
C.
has lived
【单选题】My friend hasn’t _____ till now——I hope she isn’t ill.
A.
come up
B.
made up
C.
gone up
D.
turned up
【简答题】利用PN结的（ ）制作稳压二极管和雪崩二极管。
【单选题】—I hear that Sang Lan can _____ walk _____ run till now. —But she is trying to do everything she can. [ ]
A.
either; or
B.
neither; nor
C.
not only; but also
D.
both; and
【单选题】Myra showed no sign of emotion till she reached home, ______ she broke down completely.
A.
as
B.
after
C.
when
D.
because
【单选题】She ________ in his English till now , but Wei Hua still works hard in order to be____ at it.
A.
has made a progress; better
B.
is making progress; more better
C.
is making a progress; better
D.
has made progress; better
【单选题】关于股份有限公司的下列说法符合我国公司法的规定的是（ ）。
A.
股份有限公司设董事会，其成员为3人至13人
B.
股份有限公司设经理，由董事会决定聘任或者解聘
C.
股份有限公司注册资本的最低限额为人民币300万元
D.
公司合并、分立、解散或者变更公司形式的决议，必须经出席会议的股东所持表决权的三分之一以上通过
【单选题】She tried _______, but failed; now she could do nothing but wait till her husband came.
A.
to search the pockets her key
B.
searching her keys for her pockets
C.
searching the pockets for her keys
D.
to search her keys for the pockets
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