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【简答题】
在水平桌面上,将重为 20 N 的木块沿直线匀速向前推了 5 m ,所用的推力为 4 N ,撤去推力后,木块由于惯性又前进了 1 m ,则推力所做的功是 ______ J ,重力所做的功为 ______ J 。
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反馈参考答案：
举一反三
【单选题】Which of the following statements is true?
A.
When the weather became cool, he went down the mountain and started writing books and articles.
B.
When the weather was hot, he went up the mountain and began writing.
C.
When the weather was cool, he took long walks on the mountain trails.
D.
He liked to walk in the cool evening, thinking about his experiments.
【简答题】霍乱染疫、染疫嫌疑船舶应如何实施卫生处理?
【单选题】As winter ______ the weather became colder.
A.
appeared
B.
severed
C.
started
D.
approached
【简答题】当温度升高时三极管的集电极电流IC（），电流放大系数β（）。
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