如果x表示随机事件发生机会的大小，那么x的取值范围是______．

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问题填空题

答案

如果一个随机事件发生的可能性很大，那么x的值接近1又不等于1，

如果一个随机事件发生的可能性很小，则x接近0，

故x的取值范围是：0＜x＜1．

故答案为：0＜x＜1．

填空题

用所给动词的适当形式填空，必要时刻加助动词或情态动词。

1. He _______ ever _______ (be) to the amusement park several times.

2. I'm sorry I didn't finish _______ (write) my composition.

3. I have been _______ (skate) for two hours.

4. _______ you _______ (teach) us computer science next year.

5. I went there last year and _______ (fall) in love with it.

6. They _______ (fly) to the moon in ten years.

7. I will go to the water park if it _______ (not rain) tomorrow.

8. When Mr. Cook got home, his son _______ (listen) to the radio.

9. The old man makes a living by _______ (sell) vegetables.

10. The box is too heavy. I'm not strong enough _______ (carry) it.

单项选择题

当滑动轴承的长径比大于1.5时，一般选用（）。

A、整体式滑动轴承

B、对开式滑动轴承

C、锥形表面滑动轴承

D、自动调心轴承