立克次体病原学检查，脏器组织和节肢动物可做切片检查，切法要求_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

立克次体病原学检查，脏器组织和节肢动物可做切片检查，切法要求越薄越好，一般不超过（）

A、3~4微米

B、7~8微米医学全在.线提供

C、10~15微米

D、20~25微米

E、30~40微米

答案

参考答案：A

选择题

Mom asked me to _____________ grandpa when she was out.

A．look up

B．look at

C．look for

D．look after

选择题

—It's 10 o'clock now. I must go.

—It's raining heavily outside. Don't leave ______ it stops. [ ]

A. since

B. until

C. when

D. because