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【单选题】
颗粒在水中的沉降过程呈离散状态,其形状、尺寸、质量均不改变,下沉速度不受干扰,则该沉降称为( )A.
自由沉降
B.
絮凝沉降
C.
拥挤沉降
D.
压缩沉降
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举一反三
【简答题】选择课文中你最喜欢的一句话,默写下来。
【简答题】We should e______( 鼓励 ) a student when he meets with difficulties.
【单选题】I want to know _____ .
A.
when will he come back
B.
when he will come back
C.
when he comes back
D.
when is he coming back
【简答题】A．When he goes for a walk. B．When he drives the car. C．When he passes somebody. D．When he chats with Peter.
【单选题】The woman lived in Germany______.
A.
when he was first born
B.
when he was a child
C.
when he has his first child
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