一犬突然出现呕吐，继而腹泻，粪便开始为灰黄色，接着排番茄汁样

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问题单项选择题

一犬突然出现呕吐，继而腹泻，粪便开始为灰黄色，接着排番茄汁样稀粪，恶臭难闻；血常规检查，白细胞总数显著减少，粪检未见虫卵。进一步确定病原应进行( )。

A．B超检查

B．病理剖检

C．生化试验

D．血清学试验

E．尿常规检查

答案

参考答案：D

单项选择题

She was just about to explain ______ she hadn't passed her maths test chiefly out of carelessness ______ her uncle came.

A. her mother when

B. to her mother
why that
C. her mother
that when
D. to her mother
that when

单项选择题

下列细胞组分需要最高离心速率离至下层的是（）。

A.细胞核

B.高尔基体

C.线粒体

D.叶绿体