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问题 单项选择题

魏晋南北朝时期的（）精确计算出圆周率是在3.1415926—3.1415927之间，此成果比外国早近一千年。

A、祖冲之

B、刘徽

C、贾思勰

D、陶渊明

答案

参考答案：A

单项选择题 B型题

男性，48岁，2小时前被巨木砸伤髋部，伤后下肢活动受限，不能自行排尿。查体：下腹部可及膀胱，叩实音，骨盆挤压试验阳性，导尿失败（）

A. * * 膜部挫伤

B. * * 球部挫伤

C.膀胱腹膜外破裂

D. * * 膜部断裂

E. * * 球部断裂
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单项选择题

Some of the keys have a special use. There are referred to as command keys. The 3 most common are the Control or (66) , Alternate or (67) and the Shift keys though there can be more (the Windows key for example or the Command key). Each key on a standard keyboard has one or two characters. Press the key to get the lower character and hold Shift to get the upper. Disk Drives - All (68) need a drive to get information off - or (69) - and put information on the disk - or (70) . Each drive is designed for a specific type of disk whether it is a CD, DVD, hard disk or floppy. Often the term ’disk’and ’drive’are used to describe the same thing but it helps to understand that the disk is the storage device which contains computer files-or software - and the drive is the mechanism that runs the disk.

A．sets

B．dishes

C．disks

D．panels
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