Bill is in the classroom, doing ______ homework.[ ]
A. his
B. he
C. him
D. himself
答案:A
下列心电图应诊断为(图1)()
A.心房纤颤
B.室性心动过速
C.室上性心动过速
D.左前分支阻滞
E.房室传导阻滞
下列现象中,不属于惯性现象应用的是( )
A.用手拍打衣服的尘土
B.锤头松了,将锤柄在地上撞几下
C.汽车司机为了安全应系好安全带
D.运动员采用助跑跳远