有关CT训练球管的论述,错误的是() A.每日开机后首先对CT机球管训练(预热) B

题型:单项选择题

问题:

有关CT训练球管的论述,错误的是()

A.每日开机后首先对CT机球管训练(预热)

B.球管训练时管电压由低逐渐升高

C.球管训练使球管内真空度提高

D.开机后3小时没做病人亦应重新训练

E.球管训练增加了曝光次数,不利于保护球管

考点:放射医学(医学高级)放射医学综合复习题放射医学综合复习题题库
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The final exam comes with June. When the exam ends(结束), the summer vacation begins. Boys and girls have about two months to relax. The summer vacation is the best time of the year for most children. The weather is usually fine. They can swim, go to summer camp or visit other places with their parents.

Of course, the beaches are good places for relaxing. Some children are lucky to live near the beach. They can play in the water. But for the children far from the sea, they go to the beaches for one or two weeks with their parents.

Why do children like spending their summer vacation on the beaches? It is because they like the sand(沙), the sun, the cool wind and the sea water. There are lots of new things to see, nice things to eat, and exciting things to do.

小题1: School children usually have exams _____.

A.in June

B.after June

C.before June

D.in July小题2:The summer vacation is about ______.

A.two weeks

B.two months

C.three months

D.two days小题3:Why do children like summer vacation?

A.because the weather is fine.

B.because it is long.

C.because the weather is fine and they can have lots of activities(活动).

D.because they can have exams.小题4:Children far from the beach can enjoy the sea ______.

A.in the evening

B.very often

C.for two months

D.for one or two weeks小题5:Which of the following is not right?

A.Children like going to the beaches only because they can see lots of new things.

B.Children like summer vacation best.

C.Children can swim and enjoy the sand, wind, and water on the beaches.

D.Children like to spend their summer vacations on beaches.

题型:单项选择题

秦朝李斯推行郡县制的主张被称为“千古创论”。郡县制(  )

A.始于秦朝的建立

B.终于汉初分封王国

C.利于加强中央集权

D.便于扩大秦国版图

题型:单项选择题
One afternoon,my son Adam asked me, "Are all people the same even if they are different in color?"
I thought for a minute, and then I said, "I'll explain,26 you can just wait until we make a quick  27  at the grocery store. I have something  28  to show you.”
At the grocery store, we  29  some apples --- red, green and yellow ones. Back home, I told Adam, "It's time to  30  your question. " I put one apple of each  31  on the table. Then I looked at Adam, who had a  32  look on his face.
"People are like apples. They come in all  33  colors, shapes and sizes. On the  34  , some of the apples may not  35  look as delicious as the others." As I was talking, Adam was  36  each one carefully.
Then, I took each of the apples and peeled (削皮) them,  37  them back on the table, but  38 different place.
"Okay, Adam, tell me which is which. "
He said, "I   39   tell. They all look the same now. " "Take a bite of   40  . See if that helps you  41  which one is which.”
He took  42  , and then a huge smile came across his face. "People are  43  like apples! They are all different, but once you  44   the outside,  they're pretty much the same on the inside. "
He totally  45  it. I didn't' need to say or do anything else.
小题1:
A.although B.so C.because D.if
小题2:A. stop         B. start           C. turn         D stay
小题3:A. expressive    B. encouraging     C informative   D. interesting
小题4:
A.bought B.counted C.saw D.collected
小题5:
A.checkB.mention C.answer D.improve
小题6:A. size          B. type            C: shape       D. class
小题7:
A.worried B.satisfied C.proud D.curious
小题8:
A.ordinaryB.normal C.different D.regular
小题9:
A.outside B.wholeC.table D.inside
小题10:
A.still B.even C.onlyD.ever
小题11:A. examining    B. measuring       C: drawing     D. packing
小题12:
A.keeping B.placing C.pulling D.giving
小题13:
A.on B.sward C.forD.in
小题14:A. mustn't       B. can't           C shouldn't     D. needn't
小题15:
A.each one B.each other C.the other D.one another
小题16:
A.admit B.consider C.decide D.believe
小题17:A. big bites     B. deep breaths     C a firm hold   D. a close look
小题18:
A.just B.always C.merely D.seldom
小题19:A. put away     B. get down       C hand out      D. take off    
小题20:
A.madeB.took C.got D.did
题型:单项选择题

已知A、B、C、D、E分别为Ca(OH)2、Ca(HCO3)2、HCl、Ba(NO3)2、Na2CO3五种溶液中的一种。现将它们相互反应情况列表如下(表中“↓”表示生成沉淀;“↑”表示生成气体;“—”表示无现象)据此可判断C是(   )

 ABCDE
C
B
A.HCl      B.Ca(HCO3)2     C.Na2CO3    D.Ba(NO3)2

题型:单项选择题

经拌合好之后再归堆放置30~90min才使用的干硬性砂浆是()。

A.干缩砂浆

B.预缩砂浆

C.干贫砂浆

D.收缩砂浆

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