发动机（）时，节气门开度小，汽缸充气量少，残余废气相对增加，

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问题单项选择题

发动机（）时，节气门开度小，汽缸充气量少，残余废气相对增加，所以需要较浓的混合气才能燃烧，耗油率增大。

A、低负荷

B、中负荷

C、高负荷

D、全负荷

答案

参考答案：A

阅读理解

阅读驿站。读对话，选择正确答案。

Lucy: Lily, let's go to the market. I want to buy some fruit.

Lily: No, I don't want to buy fruit.

Lucy: OK. Then let's go to the clothes shop. I want to buy a new dress.

Lily: Forget it! I don't want to buy a new dress.

Lucy: Well. What do you want to buy?

Lily: Ice cream! Let's go to the restaurant to buy an ice cream.

Lucy: OK. Let's go.

1. What does Lucy want to buy at the market? [ ]

A. Vegetables.

B. Fruit.

C. A new dress.

2. Where does Lucy buy a new dress?[ ]

A. Market.

B. Restaurant.

C. Clothes shop.

3. What does Lily want to eat? [ ]

A. An apple.

B. Fruit.

C. Ice cream.

4. Where do they go at last (最后)? [ ]

A. Market.

B. Restaurant.

C. Clothes shop.

计算题

有一件标称纯金的实心工艺品，其质量为100g，体积为6cm³，请你至少有两种方法判断它是否由纯金制成的？（）