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问题 单项选择题

一个水库，原计划每天放水300立方米抗旱，这样在没有补充水源的情况下，可以灌溉120天。后来由于修改方案，每天少用水60立方米。这样，这个水库存水可以多使用多少天( )

A．20天

B．30天

C．40天

D．45天

答案

参考答案：B

单项选择题

FonsWeaver780B以太网盘GFI1，对外提供8/2路FE以太网电接口（LAN口）和2个GE以太网接口，对内提供16/24个FE全双工以太网数据接口（WAN口），共占用（）个VC4的带宽？

A.64

B.4

C.8

D.16
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单项选择题

High Towers, a’ company that occupies several office buildings, is considering installing new energy-efficient lightbulbs in its buildings. The new bulbs require less than half the electricity consumed by the conventional bulbs currently used to produce the same amount of light. The new bulbs also last considerably longer. It follows that by replacing old bulbs as they burn out with the new kind of bulb, High Towers would significantly reduce its overall lighting costs.
Which of the following, if true, most strengthens the argument given

A．If the new bulbs are widely adopted, as seems likely, they will be produced in large enough quantities to be offered at prices comparable to those of conventional bulbs.

B．The utility that supplies High Towers with electricity offers discounted rates to its largest customers.

C．High Towers has recently signed a contract to occupy an additional small office building.

D．High Towers has begun a campaign to encourage its employees to turn off lights whenever they leave a room.

E．(E) The company that manufactures the new bulbs has been granted a patent on the innovative technology used in the bulbs and thus has exclusive rights to manufacture them.
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