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问题 单项选择题

圆弧插补指令中，可用圆弧半径R指定代替I、K指定，当R为负值时，表示加工的圆弧（）。

A、小于180°；

B、大于180°；

C、由X、Z地址的值确定

答案

参考答案：B

填空题

单词拼写：根据括号里的汉语及首字母的提示写出单词的正确形式。

1. Which _______ (陈述) is false?

2. If a boy is c_______, he is always asking questions.

3. Afraid of being _______ (understand) by others, Mr. Smith tried hard to make himself clear.

4. There are not many _______ (amuse) in this town.

5. The park has much _______ (吸引人的事物) for children.

6. Something is wrong with the e_______ of the car. It can't start.

7. _______ (admit) to the school is by examination only.

8. Yuan Longping devotes himself to _______ (science) research

9. Up to now, there is no c_______ for AIDS around the world.

10. Robert _______ (宣布) that he would run for (竞选) the position.

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选择题

化学已渗透到人类生活的各个方面。下列说法正确的是[ ]

A．绿色化学的核心是应用化学原理对环境污染进行治理

B．Al2O3、MgO可用作高温材料，二氧化硅是生产光纤制品的基本原料

C．寻找高效催化剂，将水变为汽油以缓解目前的能源危机

D．2010年广州亚运会的场馆所用的材料都是新型无机非金属材料

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