人尿中含氮0.93%,如这些氮只存在于尿素中,则人尿中含尿素[CO(NH2)2]的质量分数为( )
A.0.20%
B.1.00%
C.1.99%
D.0.02%
答案:C
I insisted on ______ my father _______ his medicine every day, but he refused.
A.reminding; taking
B.to remind; to take
C.to remind; taking
D.reminding; to take.
下肢深静脉通畅功能试验的目的是了解
A.交通支瓣膜功能情况
B.下肢静脉有无曲张
C.大隐静脉瓣膜功能是否正常
D.下肢深静脉有无阻塞
E.下肢深静脉瓣膜功能情况