杆形卡环与圆环形卡环相比较主要不足之处是（） A.固位作用差 B.稳定作用差 C.支

( )是存储系统的基础设施，是物流的载体，担负着物品的存储保管任务。

A．信息
B．仓库
C．运输
D．包装

男性，35岁，主诉口渴、多饮、多尿20天。检查：空腹尿比重偏低。

为确诊此病人有无尿崩症，应首先进行哪项试验（）

A.测血浆渗透压

B.禁水试验

C.测量每日尿量

D.禁水-加压素联合试验

E.高渗盐水试验

简述我国宪法与法律所规定的少年儿童的合法权利。

臭氧在大气中有什么作用？它与平流层温度的铅直分布有什么关系？

The major problem with E-mail is that it is (71) easy to use that people can become (72) with messages (73) they can possibly answer in a day. In addition, mail boxes require some management to (74) messages or archive those that might be required later. Senders don’t always know about your E-mail backlog and often send (75) messages.

A．manage

B．save

C．backup

D．dispose of