电气工具和用具应由专人保管，定期进行试验和清洗。
参考答案：原题中定期进行试验和清洗，应改为：每6个月应由电气试验单位进行定期检查。
下列哪项可使毛细血管血压升高
A．动脉血压升高
B．静脉血压降低
C．毛细血管前阻力与后阻力的比值变小
D．淋巴回流减少
E．循环系统血液充盈度增大
根据汉语提示完成句子。
1. Does your brother want ________ (当医生)?
2. She didn't know ________ (怎样学好英语).
3. Don't forget ________ (交练习本) tomorrow.
4. The room is not large enough ________ (容纳200人).
5. My grandmother is too old ________ (不戴眼镜不能看书).
6. The doctor told the boy ________ (卧床) for two days.
7. Have you any question ________ (要问)?
8. It is necessary _______ (我们学外语).
9. When he saw his mother, he was ________ (激动得说不出话来).
10. She practices reading every day ________ (为了进步) her spoken English.
