中 * * 、国务院决定将我国现行宪法实施日（）作为每年的全国法制宣传日。A、1月24日

词形变换：根据句意，写出所给单词的适当形式。

1. My classmates are from six ________ (country).

2. Danny and Jenny often go for a ________ (walk) after supper every day.

3. An airplane is ________ (fast) than a bus.

4. Laughing ________ (loud) is good for your health.

5. I can see some girls __________ (play) on the square.

6. "Where ________ (be) you yesterday?" "I was in the library."

7. Look! Jenny is ________ (look) out of the window of the train.

8. The ________ (child) are packing their suitcases. They are going to Beijing.

9. My father ________ (go) to the factory from Monday to Friday.

10. Danny ________ (break) his tail at the Palace Museum last week.

了解同类产品的目的就是要学会模仿其它同类产品。

关于利血乎，下列说法不正确的是

A．属于影响去甲肾上腺素神经递质的药物
B．降压作用温和，缓慢，持久
C．可以长期单独应用
D．有镇静，安定作用
E．降压时伴有心率减慢

诱导型技术创新

设8253三个计数器的端口地址为201H、202H、203H，控制寄存器端口地址200H。输入时钟为2MHz，让1号通道周期性的发出脉冲，其脉冲周期为1ms，试编写初化程序段。