等直径管，考虑损失，A—A断面为过流断面，B—B断面为水平面1、2、3、4各点的物理

对中性粒细胞有趋化作用的是（）

A.IL-1

B.IL-2

C.IL-8

D.IL-5

E.IL-6

下列关于宏操作的叙述错误的是______。

A．可以使用宏组来管理相关的一系列宏

B．使用宏可以启动其他应用程序

C．所有宏操作都可以转化为相应的模块代码

D．宏的关系表达式中不能应用窗体或报表的控件值

Woman: Did you really work all of these problems without any help from the bookMan: Well, most of them anyway.Question: What does the man imply

A．Most of the problems were in the book.

B．He did need help on a few problems.

C．There's more than one way to do the problem.

D．There were really too many problems to do.

腹泻伴里急后重多见于

A．结肠癌
B．痔疮
C．回盲部结核
D．直肠炎或直肠癌
E．末端回肠炎

硫酸镍水溶液作为监测仪器波长的是（）

A.400nm

B.460nm

C.510nm

D.550nm

E.700nm