心房颤动时f波的频率为()。
A.350次~600次/分
B.<150次/分
C.150次~200次/分
D.>600/分
E.250次~300次/分
参考答案:A
如图是屈肘时肌肉的协作示意图.请据图回答:图中(l)是______,当屈肘时,以它为主的肌群处于______状态;而以(2)______为主的肌群 处于______状态.
Passage ThreeQuestions 32 to 35 are based on the passage you have just heard.
A.Not look into his eyes.
B.Stare at him.
C.Keep eye contact.
D.Avoid eye contact.