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问题 单项选择题

影响燃油管理工作的指标主要有（）。

A.十六烷值，发热值，馏性和粘度。

B.硫分，灰分，残炭和钒、钠量。

C.闪点，粘度，硫分和钒、钠量。

D.闪点，粘度，比重，凝固点，灰分和杂质。

答案

参考答案：D

填空题

表达式是由操作数和【 】按一定的语法形式组成的符号序列。
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填空题

单词拼写。

1. I can't find my cat. Do you see it a ______?

2. Birds k ______ on the cage door with their beaks (喙) when they are hungry.

3. That glass is on the edge of the table. Put it in the m ______.

4. Please f ______ your dog. It is very hungry.

5. There is no milk in the bottle. It's e ______.

6. The ______ (拥有者) of these goldfish is a little girl.

7. It's ______ (必要的) for us to learn English well.

8. Look! The dog is ______ (追赶) a cat.

9. I like to keep a goldfish as a pet because it isn't any ______ (麻烦).

10. An elephant usually walks very ______ (慢).

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