送风机紧停的振动值？

I was walking around in a store. I saw an assistant pass this little boy his money back, saying, “I’m sorry, but you don’t have enough money to buy this doll.” I walked toward him and asked him who he wished to give this doll to.

“It’s the doll that my sister loved most and wanted so much for Christmas. She was so sure that Santa Claus would bring it to her.” he said.

I replied to him that maybe Santa Claus will bring it to her, and he shouldn’t worry. But he replied to me sadly, “No, Santa Claus can’t bring it to her where she is now. I have to give the doll to my mommy so that she can give it to my sister when she goes there.” His eyes were so sad while saying this. “My sister has gone to be with God. Daddy says that Mommy is going to see God very soon too, so I thought that she could take the doll with her to give it to my sister.” My heart nearly stopped. I quickly reached for my wallet and said to the boy, “What if we checked again, just in case (万一)you do have enough money?”

“Ok,” he said. “I hope that I have enough.” I added some of my money to his without letting him see and we started to count it. There was enough for the doll and even some spare money left . The little boy said, “Thank you God for giving me enough money!”

I left the store, feeling as if my life had been changed forever.

小题1:Whom did the boy want to give the doll to?

A．His mother

B．His friend

C．His sister

D．The writer小题2:The boy finally had enough money for the doll because_________.

A．he didn’t count correctly at first

B．the writer added some money

C．the assistant added some money

D．the assistant made the doll cheaper小题3:How did the writer feel at last?

A．Shy.

B．Nervous.

C．Happy.

D．Angry.小题4:What does the story tell us?

A．We should help other people in need.

B．Money does not matter.

C．We should believe in Santa Claus.

D．We should borrow money when necessary

使献血者产生不良反应的精神因素不包括（）

A.知识的缺乏，对献血的恐惧

B.看到他人晕，自己也感觉不舒服

C.采血者的态度和蔼

D.看到自己的血液发生晕厥

E.第一次献血，感觉紧张

关于急性动脉栓塞的临床表现，下列哪项是错误的（）。

A.疼痛，常伴有触痛

B.皮肤苍白、皮温下降

C.脉搏减弱或消失，甚至运动功能障碍

D.感觉异常、麻木

E.动脉栓塞的全身影响不严重

材料的美学属性包括什么？

社会医学的研究对象是（）

A.社会卫生状况及其变动规律

B.社会经济状况及其变动规律

C.卫生政策制定

D.社会发展规律

E.个人卫生状况