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问题 单项选择题 A型题

复乳WI/O/W2型，当W1不等于W2时是指下述哪一项（）

A.一组分一级乳

B.二组分一级乳

C.二组分二级乳

D.三组分一级乳

E.三组分二级乳

答案

参考答案：E

问答题

简述制动系统的工作原理。
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单项选择题

The existing terrestrial radio system has a number of basic flaws which（）.

A.can be overcome by using traditional techniques

B.can not be overcome by satellite system

C.can be overcome by satellite and digital techniques

D.can not be tackled by any modern system
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