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问题 单项选择题

大晶粒金属零件进行射线照相时，利用提高管电压和使用铅增感屏可以（）。

A、增大衍射斑的影响

B、减少或消除衍射斑的影响

C、增大焦距的影响

D、以上任何一种

答案

参考答案：B

单项选择题 A1/A2型题

关于胆道系统解剖，不正确的是（）

A.胆囊管多与肝总管汇合成胆总管

B.肝总管在十二指肠韧带走行，位于肝固有动脉的左侧和门静脉的左前方

C.胆道可分为肝内和肝外两部分

D.胆总管分为十二指肠上段、十二指肠后段、胰腺段和肠壁内段

E.胆总管肠壁内段斜穿入十二指肠降部内后侧壁
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单项选择题

In the dining room of my grandfather’ s house stood his heavy clock. Meals in the dining room were a (21) for our four generations to become one. My grandfather’ s clock always stood like a trusted old family friend, (22) us playing jokes and tellingstories, which was already a (23) of our life.

When I was a child, the old clock interested me. I watched and listened to it during (24) I was surprised how at (25) times of the day, the clock would strike three times, six times or more, with a wonderful great (26) that echoed throughout the house. The clock chimed year after year, a part of my (27) , a part of my heart.

Even more (28) to me was my grandfather’s special action each day. He meticulously (29) the clock with a special key each day. The key was magic to me. It (30) our family’ s magnificent clock ticking and striking all year round.

26（）

A.seeing 

B.hearing 

C.watching 

D.looking
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