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问题 单项选择题

下列属于击打式打印机的有

A．喷墨打印机

B．针式打印机

C．静电式打印机

D．激光打印机

答案

参考答案：B

解析： 打印机按打印原理可分为击打式和非击打式两大类。字符式打印机和针式打印机属于击打式一类。

填空题

Here are little cars that may some day take the place of today’s cars. If everyone drives such a car in the future, there will be less pollution in the air. There will also be more parking spaces in cities, and the streets will be less crowded. Three such Cars fit in the space now needed for one Car of the usual size. The little cars will cost much less to own and to drive. Driving will be safer, too, as these little cars can go only 55 miles per hour. The Cars of the future will be fine for getting around a city, but they will not be useful for long trips.

What’s the disadvantage for little cars
They will not be useful for（）
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单项选择题

共同海损理算应以的财产、状况为依据（）.

A.航次结束的地点和时间

B.航程终止的地点和时间

C.海上出事的地点和时间

D.编制理算书的地点和时间
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