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问题 选择题

用稀硫酸与铁片反应制取氢气时，下列措施不能使氢气生成速率增大的是

A．给反应体系适当加热

B．向反应体系中加水稀释

C．向反应体系中加入适量浓盐酸

D．将铁片换成铁粉

答案

答案：B

单项选择题

百合花在中国文化中的含义是（）

A.百年好合

B.葬礼

C.祝寿

D.道歉
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单项选择题

One of the functions of the (71) is to store the applications programs or the various secondaries. The (72) may have similar or dissimilar functions. The same control code received from two different, secondaries may warrant two different actions on the part of the host computer. If the system so requires, the host computer must also provide (73) for the centralized data and the software for database management. Data information is normally stored in auxiliary memories to which the computer has ready access. The (74) peripherals connected to the host computer allow for human entry and intervention. As needs change, application programs may require additions, deletions, or changes. Data link problems also arise which are (75) the range of the computer’s programmed capabilities. In such cases, human entry is required to make the necessary changes to resolve the existing problems.

A．peripherals

B．host computer

C．the interface

D．the client
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