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【单选题】
This op-amp is connected as a(n) ( ).A.
inverting constant-gain multiplier
B.
noninverting constant-gain multiplier
C.
voltage buffer
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【单选题】斜齿轮啮合时的条件要求分度圆上的模数和压力角相等外，还要求两齿轮分度圆上的螺旋角（）。
A.
β必须大小相等而方向一致
B.
β必须大小相等而方向相反
C.
β 1 2而方向一致
【简答题】A．effective B．passive C．relative D．expressive
【简答题】A．Warm and humid. B．Cold and humid. C．Warm and dry. D．Cold and dry.
【简答题】下列关于一人有限责任公司的说法中，错误的是（ ）。
【简答题】The weather is getting ______ (hot)and ______ (humid).
【单选题】The following statements about the expressive plane are wrong except________________.
A.
The expressive plane gives us a clear picture of what we are trying to listen.
B.
Composers are good at defining music's expressive side.
C.
People hold different ideas about the expressive plane of listening to music.
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