下列行为属于法律鼓励的是[ ] A．破坏草坪 C．侮辱老师 B．破坏公共秩序和财

立方根是它本身的数是（　　）

A．1

B．-1

C．0或-1

D．0或±1

根据句意和提示，完成下列句子。

1. He was _________ (吸引) by her charm.

2. Mr. Li is one of the _________ (受害者) in the robbery.

3. My grandfather has been ________ (死亡) for ten years.

4. How did she _______     (成功) in the end?

5. Can you _____       (想象) what life will be like by 2100 on Earth ?

6. A police told him that a jewellery shop had been ______ (rob) .

7. He was charged with _______ ( break) into several computer systems over the last year.

8. Can you offer me some ________ (advice)?  They would be the most valuable.

9. Mrs. Li told me that she _______ (finish) the work already.

10.The old woman passed away _________ (peace) in her nineties .

与X线质无关的是

A．管电压
B．X线量
C．X线光子能量
D．对物质的穿透力
E．半价层厚度

怎样才能保证荒煤气在集气管内的冷却效果？

存储周期指的时间是( )。

A．从开始写入到存储单元存放数据的时间

B．从开始读出到获得有效数据的时间

C．连续启动两次独立的存储器操作所需要的最小间隔时间

D．读出一次再重写一次所需的时间