左心室容量负荷（前负荷）加重见于（）
A．二尖瓣狭窄伴肺动脉高压
B．主动脉瓣狭窄
C．三尖瓣关闭不全
D．主动脉瓣关闭不全
E．室间隔缺损
参考答案：H
I did much worse than Lucy in the exam. I made ______ mistakes than her. [ ]
A. many
B. fewer
C. less
D. more
一般情况下，检验检疫机构只签发( )正本。
A．两份
B．至少一份
C．一份
D．一份或两份
