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【单选题】
（）形搅拌浆常用于打蛋机。A.
筐
B.
拍
C.
钩
D.
A、B和C
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反馈参考答案：
举一反三
【单选题】在N不变的前提下,非均匀量化与均匀量化相比
A.
大、小信号的量化信噪比均不变
B.
大信号的量化信噪比提高
C.
小信号的量化信噪比提高
D.
大小信号的量化信噪比均提高
【单选题】—I came to your home yesterday afternoon, but nobody was in. — Oh, we ________ some shopping in the supermarket. [ ]
A.
have done
B.
did
C.
were doing
D.
are doing
【单选题】— I came to your office yesterday morning, but nobody was in. — Oh, we _____a meeting in the meeting room. [ ]
A.
have had
B.
had
C.
were having
D.
are having
【单选题】在N不变的前提下,非均匀量化与均匀量化相比( )
A.
小信号的量化信噪比提高
B.
大信号的量化信噪比提高
C.
大、小信号的量化信噪比均提高
D.
大、小信号的量化信噪比均不变
【简答题】如果烟道某处的O2含量为6.5%，请用简化公式计算该处的过量空气系数。
【单选题】- I came to your home yesterday afternoon, but nobody was in. - Oh, we ________ some shopping in the supernarket. [ ]
A.
have done
B.
did
C.
were doing
D.
are doing
【简答题】交流接触器在运行中产生很大噪声的主要原因是（），铁芯不正，短路环损坏。
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