— Hi, Vera, have you checked the account

搜题请搜索小程序“爱下问搜题”

问题选择题

— Hi, Vera, have you checked the account yet?

— Certainly, I ______ it five times even though you told me to do it twice.[ ]

A. checked

B. will have checked

C. have been checking

D. had checked

答案

答案：A

单项选择题

用三尖瓣反流血流怎样定量计算肺动脉收缩压()

A、RVSP=△P(TR)(三尖瓣反流峰速换算压差)+RAP

B、RVSP=RVDP+RAP

C、RVSP=△=AP(MR)(二尖瓣反流峰速换算压差)+RAP

D、RVSP=△p(AR)(主动脉瓣反流峰速换算压差)+RAP

E、RVSP=AP(TR)(三尖瓣反流峰速换算压差)-RAP

综合

读“江西省水土流失面积的增长图”，完成下列各题。

（1）此图说明我国南方地区________严重，不少地区已引发了_________全面恶化。

（2）这说明我国南方丘陵山区的__________关系日趋紧张。

（3）简要说明产生上述现象的原因及造成的危害。