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问题 选择题

盐酸、稀硫酸在水溶液中都能产生H+，故有许多共同的性质。下列有关叙述正确的是[ ]

A．打开盛有浓盐酸和浓硫酸的试剂瓶瓶塞，在瓶口都有白雾

B．稀盐酸和稀硫酸都可用于除铁锈

C．浓盐酸、浓硫酸都可用来干燥氧气

D．在稀盐酸、稀硫酸中滴加氢氧化钡溶液，都有白色沉淀

答案

答案：B

单项选择题

软件生命周期一般可以分为两个阶段，它们分别是

A．分析和设计

B．编码和测试

C．开发和运行

D．规划和设计
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单项选择题

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.

The key to SNMP (71) is its simplicity. It has a small command set that does a good job of collecting information from (72) any network device. In a SNMP environment, (73) of the work is handled by the network management system. Devices that are being managed are not (74) with processing (75) that might affect their performance.

73（）

A．most

B．many

C．much

D．a lot
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