The _____________ (明信片) is beautiful.[ ]
A. card
B. post card
C. post office
答案:B
A distribution with a mean of 15 and a range of 2 to 25 would be:()
A. normally distributed.
B. positively skewed to the right.
C. cannot be determine.
肺动脉高压较少发生于()。
A.风湿性心脏病,主动脉瓣狭窄伴关闭不全
B.风湿性心脏病,二尖瓣狭窄伴关闭不全
C.风湿性心脏病,二尖瓣重度狭窄
D.风湿性心脏病,肺动脉瓣狭窄
E.风湿性心脏病,主动脉瓣狭窄伴关闭不全