声波的频率范围是( )Hz。
A.20~200 B.20~2000C.20~20000 D.20~200000
参考答案:C
填写句子完成对话。(10分)
A: 小题1:______________________________________________________________?
B: I’m visiting my grandmother for vacation.
A: 小题2:______________________________________________________________?
B: She lives in Tianjin.
A: 小题3:_____________________________________________________________?
B: It takes about six hours to get there by train.
A: 小题4:______________________________________________________________?
B: I’m leaving on Friday.
A: How long are you staying there?
B: About two weeks.
A: Have a good time.
B: 小题5:___________________________________________.
三棱针的注意事项的叙述错误的有()。
A.手法宜稳、宜重、宜准、宜快
B.之前应该做必要的解释工作,消除患者顾虑
C.严格消毒,防止感染,体位舒适,谨防晕针
D.点刺出血量以数滴到3~5ml为宜
E.每日或隔日一次,1~3次一个疗程;出血量多者,每周1~2次