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【多选题】
离子交换树脂的优点有A.
成本低
B.
设备简单
C.
不用或少用有机溶剂
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反馈参考答案：
举一反三
【单选题】—What was your brother doing at this time yesterday? —He was reading a magazine ________ I was writing an e-mail at home. [ ]
A.
as soon as
B.
after
C.
until
D.
while
【单选题】三相感应电动机等效电路中的附加电阻 (1-s) R'2/s上所消耗的电功率应等于( )。
A.
输出功率P2
B.
输入功率P1
C.
电磁功率Pem
D.
总机械功率PΩ
【单选题】The author implies that in the development of man, ______.
A.
speech, agriculture and writing are the most important factors
B.
the origin of the language can not be traced
C.
both oral language and written language come out of the picture language
D.
the ape might be taught to master speech
【单选题】The Grammar-Translation Method neglects______.
A.
listening and reading
B.
speaking and writing
C.
reading and writing
D.
listening and speaking
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