关于文教科学卫生支出的说法，正确的有（）。 A．科学支出属于生产性支出 B．教育支出

对于AB级而言，源至工件表面的距离L₁与有效透照长度L₃的关系应满足（）。

A、L₁≥2L₃

B、L₁≥3L₃

C、L₁≥1.5L₃

D、以上都不对

If you do not use your arms or your legs for some time, they become weak; when you start using them again, they slowly become strong again. Everybody knows that. Yet many people do not seem to know that memory works in the same way.

When someone says that he has a good memory, he really means that he keeps his memory in practice by using it. When someone else says that his memory is poor, he really means that he does not give it enough chance to become strong.

If a friend says that his arms and legs are weak, we know that it is his fault. But if he tells us that he has a poor memory, many of us think that his parents are to blame, and few of us know that it is just his own fault.

Have you ever found that some people can't read or write but they have better memories? This is because they cannot read or write and they have to remember things; they cannot write them down in a little notebook. They have to remember days, names, songs and stories; so their memory is the whole time being exercised.

So if you want to have a good memory, learn from the people: practise remembering.

小题1:If you do not use your arms or legs for some time, ______.

A．you can't use them any more

B．they will become stronger

C．they become weak but they slowly become strong again

D．they become weak and won't become strong until you use them again小题2:Some people can't read or write, but they usually have better memories, because ______.

A．they can't write everything in a little notebook

B．they have to use their memories all the time

C．they have saved much trouble

D．they have saved much time to remember things小题3:The main reason for one's poor memory is that ______        

A．he does not use his arms or legs for some time

B．he can't read or write

C．his father or mother may have a poor memory

D．his memory is not often used小题4:Give the best title for this passage.

A．How To Have A Good Memory

B．Don't Stop Using Your Arms Or Legs

C．Strong Arms And Good Memories

D．Learn From The People

某医院儿科收治了一名高热患儿，经医生初诊"发热待查，脑炎可能"。急诊值班护士凭多年经验，对患儿仔细观察，发现精神越来越差，末梢循环不良，但患儿颈部不强直。于是，护士又详细询问家长，怀疑是中毒性菌痢。经肛门指诊大便化验，证实为菌痢，值班护士便及时报告医生，经医护密切配合抢救，患儿得救。

该护士符合医护关系的哪条道德要求（）

A.学习与竞争

B.平等与尊重

C.明确分工，各司其责

D.真诚与负责

E.团结协作，密切配合

经测定由C₃H₇OH和C₆H₁₂组成的混合物中氧的质量分数为8%，则此混合物中氢的质量分数是[ ]

A．78%

B．22%

C．14%

D．13%