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【单选题】
下列关于擦法的说法错误的是( )A.
擦法做的是快速的直线往返运动
B.
擦法操作时可使用润滑剂以保护皮肤,增强手法效应
C.
擦法操作时直接接触皮肤,不要膈衣而擦
D.
指擦法往返距离要尽量拉长
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【简答题】直流电路如图所示,E=15V,I k =5A,R=5Ω,求通过电源的电流,并求电源的功率。判断是消耗电能还是产生电能
【单选题】About parenthetical expressions, which of the following is not correct?
A.
They are often used to give additional information.
B.
They help to make the information more detailed.
C.
They make the information more abstract and easier to understand.
D.
They offer an easy way of giving additional explanation.
【简答题】国家垄断资本主义对经济宏观管理和调节代表着每一个资本家的利益。
【单选题】At the end of the first paragraph, the writer includes a parenthetical remark about the 7-second mini-commercials currently seen in Japan and Europe. The writer most likely includes this information t...
A.
the United States has fallen behind its Japanese and European competitors in some important areas of development
B.
television commercials seen in the United States may well become even shorter than they are at present
C.
television commercials in other parts of the world use even more advanced technology than that used in the United States
D.
the quality of a television commercial is net necessarily related to its length
【简答题】放大电路如题 32 图所示, V CC = 12 V , R B1 = 15 kΩ , R B2 = 10 kΩ , R E = R C = R L =2 kΩ , U BE = 0.8 V , ß = 100 。 ( 1 )画出直流通路,求电路的静态工作点 I BQ 、 I CQ 和 U CEQ 。 ( 2 )试求该电路的电压放大倍数 A u = u o / u i ,输入电阻 r i 以及输出...
【单选题】The word 'paradox' in paragraph 1 is ______.
A.
a parenthetical expression
B.
a difficult puzzle
C.
an abnormal condition
D.
a self-contradiction
【单选题】直流电路如图 7 所示, E=15V , I k =5A , R=5Ω ,恒压源 E 的工作状况是 ( )
A.
吸收功率 30W
B.
发出功率 30W
C.
吸收功率 75W
D.
发出功率 75W
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