质量相同的甲、乙两个圆柱体，半径之比r甲：r乙=3∶1，静止在水_爱下问搜题

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问题选择题

质量相同的甲、乙两个圆柱体，半径之比r_甲：r_乙=3∶1，静止在水平桌面上，它们对桌面的压强之比P_甲：P_乙为[ ]

（A）3∶1

（B）9∶1

（C）1∶3

（D）1∶9

答案

答案：D

填空题

用所给疑问词填空。

where When Who Why What Which

1. —            are you doing?
    —I'm eating lunch.
2. —            is picking up leaves?
    —Sarah.
3. —             do you like spring?
    —Because I can fly kites.
4. —            are they?
    —They are in the woods.
5. —             do you get up?
    —I get up at 6:00.
6. —            season do you like best?
    —I like summer.

单项选择题

在英语学习中，学生在学习eve(眼)和ball后学习eyeball就比较容易，这种现象属于()。

A.一般迁移

B.负迁移

C.水平迁移

D.正迁移