某正弦式交流电流随时间变化的i-t图象如图所示，由图象可知，这个交流电流的频率和

Mr.Smith is 70 years old.Every morning he goes to the park to exercise.He has good eating habits.He eats fruit and vegetables every day.He hardly drinks and never eats junk food.Sometimes he goes to the tea house or play chess with his friends.9.He always takes a walk in the graden in the afternoon.. 10.He goes to the library twice a month.Every night he watches TV for half an hour and he never goes to bed late.So he still looks young and is pretty healthy.

小题1:___________________________________________________________________

小题2:__________________________________________________________________

把0.945保留一位小数约是______，把它精确到百分位约是______．

女性患者，56岁。近2个月内出现5次突然不能言语伴右侧肢体无力，每次持续6～15分钟。既往有严重神经官能症和头痛病史。现神经系统检查正常。

最可能的诊断为（）

A.癫痫小发作

B.偏瘫性偏头痛

C.短暂性脑缺血发作（TIA.

D.颈椎病

E.癔病发作

粉针剂的制备方法有无菌粉末直接分装法和（）

成本控制常用的基本方法就是标准成本法。( )