24a2b3c（a+b-c）-18a3bc2（c-b-a）-36abc（a-c+

患者风湿性心脏病行二尖瓣置换术后若瓣膜功能正常，下列不应该出现的情况是

A．二尖瓣口舒张期血流速度1．5m／s

B．心尖四腔心切面人工瓣瓣周舒张期可见红色血流

C．二尖瓣口收缩期少量反流血流信号

D．三尖瓣口收缩期少量反流血流信号

E．肺动脉瓣口舒张期少量反流血流信号

第二节短文改错 (共10小题；每小题1.5分，满分15分)

此题要求改正所给短文中的错误。对标有题号的每一行做出判断∶

如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误), 则按下列情况改正∶

该行多一个词∶把多余的词用斜线（\）划掉, 在该行右边横线上写出该词,并也用斜线划掉。

该行缺一个词∶在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

该行错一个词∶在错的词下划一横线,在该行右边横线上写出改正后的词。

注意∶原行没有错的不要改。

Get a good education is more important today than                 76． __________

ever before. In Canada mostly children attend public                 77． __________

schools. Public schools are mainly found by governments             78． ________

through tax income. Students in Canada taught in                    79． _________

English and in French. The rests of Canadian children          80．_______

attend private schools, that are supported mainly by fees      81．_______

paying by parents. By law, the children must attend                 82．_____

the school from age 5 to 16. There are several different               83． ________

levels in the Canadian education system .The first was                    84．_____

called Elementary Schools, which include kindergartens                     85．________

through grade 7 or 8.

均数与标准差适用于（）

A.正偏态分布

B.负偏态分布

C.正态分布

D.偏态分布

E.不对称分布

下列哪项最有助于狂犬病的诊断（）

A.脑组织中找到内氏小体

B.出现恐惧不安和恐水

C.曾被可疑动物咬伤

D.血清中和抗体阳性

E.脑脊液细胞数偏高

损害作用