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【简答题】
在放大电路中,当负载R L =1KΩ时,输出电压为1V。负载电阻断开,输出电压上升到1.1V,则该放大电路的输出电阻R 0 为( )Ω。
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举一反三
【多选题】凸轮机构的从动件按从动件端部形状不同可分为( ) 三种形式。
A.
尖顶从动件
B.
滚子从动件
C.
平底从动件
D.
圆底从动件
【简答题】We usually have three meals. We have breakfast, lunch and supper. We often have more time for lunch and supper, and we eat a big lunch or supper. But a good breakfast is very important (重要的). It’s eas...
【多选题】按凸轮的形状不同可分为( )三种形式。
A.
盘形凸轮
B.
移动凸轮
C.
圆柱凸轮
D.
弧形凸轮
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A.
直线型
B.
书本型
C.
经验型
D.
从众型
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【单选题】—Your brother often disagrees with you, __________ he? —__________. We often have different opinions. [     ]
A.
does; Yes
B.
doesn’t; Yes
C.
does; No
D.
doesn’t; No
【单选题】We often have sports after class, and I like to play _____ basketball.
A.
a
B.
an
C.
the
D.
/
【单选题】We often have to stay up for our study though we to have enough sleep. [     ]
A.
told
B.
have told
C.
are told
D.
were told
【简答题】阅读理解。 We usually have three meals. We have breakfast, lunch and supper. We often have more time for lunch and supper, and we eat a big lunch or supper. But a good breakfast is very important (重要的). It...
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