什么叫安全电压?
参考答案:
在各种不同环境条件下,人体接触到有一定电压的带电体后,其各部分组织(如皮肤、心、脏、呼吸器官和神经系统等)不发生任何损害时,该电压称安全电压。
痫病风痰闭阻证首选方剂是()
A.礞石滚痰丸
B.涤痰汤
C.定痫丸
D.二陈汤
E.顺气导痰汤
用所给词的适当形式填空。(5分)
小题1:People are enjoying (walk) around the town.
小题2: Gina decided ( forget) all her problems.
小题3:Who is the (funny) actor in the movie?
小题4: Don’t read this book ,because it is (mean) .
小题5: The farmers expect (have) a harvest(丰收) this autumn.