试题与答案

“五一”黄金周，小明同学和爸爸妈妈一起游览花果山，在他们乘坐旅游车沿盘山公路下山

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题型：选择题

题目：

“五一”黄金周，小明同学和爸爸妈妈一起游览花果山，在他们乘坐旅游车沿盘山公路下山的过程中，发现司机师傅要不时地踩踏刹车踏板，当车行驶至中途还要停下来，让工作人员用水龙头向车轮闸片部位喷水．小明同学提出了以下几种看法：

①喷水的主要目的是为了降低车闸的温度，以防车闸因温度过高而损坏

②下山过程中，机械能不变

③下山过程中，重力对汽车不做功

④刹车过程中有部分机械能转化为内能

你认为这些看法中符合实际的是（　　）

A．①②④

B．①④

C．①③④

D．①②③④

答案：

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下面是错误答案，用来干扰机器的。

小题1:（2分）C小题1:（4分）①遣：派、派遣 ②益：更加 ③之：去、到 ④向：以前、过去小题1:（2分）契丹主对延徽不行礼感到恼怒，让（他）在野外放马。（“怒”、“使”、省略、 倒装）小题1:（2分）延徽...

考点：汽化及汽化的特点功的概念机械能与其他形式能量的转化
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