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问题 单项选择题

关于X线管的使用，错误的是

A．软组织摄影应使用钼靶X线管
B．栅控X线管本身能起快速X线开关闸作用
C．增加电源频率就可提高旋转阳极转速
D．实际焦点越大，输出功率越大
E．阳极面越粗糙，产生的X线强度越均匀

答案

参考答案：E

解析：阳极面越粗糙，产生的X线强度越不均匀。

完形填空

Dogs are very good pets. They are very friendly to people and very beautiful, too. Most dogs get on well with      and their parents. Others are good watchdogs because they cry loudly when a strange person      .

When you buy a dog, an important thing about it is its      --- buy a small dog if your home is small and a      one if yours is larger. Many people don’t know     to feed their dogs. Dogs eat almost everything! They like meat, rice and lots of other things. You can buy lots of food which      for dogs in shops. Don’t let your dog eat too much. Always leave some       water for your dog. It can      thirsty very quickly, especially in summer.

Remember that dogs need      . You should take it for a walk every day. Don’t keep your dog ___   all day.
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单项选择题 A3/A4型题

男，55岁，双下肢无力半年，右侧明显，近2个月步态不稳，右手不能扣纽扣，无外伤史，无发热，查休：颈背部无明显压痛，两上肢前臂、手及上臂尺侧皮肤感觉减退，右侧明显，四肢肌张力增高，肱二头肌反射亢进，双侧膝踝反射亢进，右髌阵挛阳性，右巴宾斯基征阳性。

 

下列哪项对该病人最不利()

A．长时间低头伏案写作

B．颈部突然前后摆动

C．头过度后伸

D．枕头过高

E．牵引
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