将带火星的木条伸入盛装下列气体的集气瓶,能使木条复燃的气体是( ) A.氮气 B

题型:选择题

问题:

将带火星的木条伸入盛装下列气体的集气瓶,能使木条复燃的气体是(  )

A.氮气

B.氧气

C.二氧化碳

D.空气

考点:氧气的性质
题型:选择题

在工资核算系统中,单项数据录入是指逐个记录地录入指定的某一项或若干项的工资数据,一般适用予录入无规律的变动数据,例如水电费、房租等。

题型:选择题

When Dan Shaw gets up from the sofa in his home, Cuddles is never far away. When he wants to go outside, he doesn’t take Cuddles out for walk—Cuddles takes him for a walk. Cuddles is clearly no ordinary family pet. It is a two-foot-high miniature horse and serves as the guiding eyes of Shaw, who is blind.

When Shaw lost his sight, his wife suggested he apply for a guide dog. Shaw, an animal lover, said he couldn’t bear to part with a dog (which usually lives about eight to ten years) and get used to a new one, perhaps several times in his life.

Then Shaw heard of a program about the tiny guide horses. He learned that the horse possess many qualities that that make them an excellent choice for guiding people. They are clean friendly, smart and have great memories. They can be trained to remain calm in noisy and crowded places. Best of all, they live for 25-25years, which would enable Shaw to have the same guide companion for most or all of his life.

Shaw immediately applied to be and was accepted as the first person to receive a guide horse. The instant he met Cuddles, he knew he was making the right choice. Then he began his training.

Through training ,Shaw and Cuddles learned to find way on busy streets, step over curbs(便道沿儿)and find elevator buttons. Cuddles even demonstrated(显示)its ability to step in front of Shaw and block him, to prevent him from walking into a dangerous situation. The little horse also expertly led Shaw through busy shopping malls. They got along without any difficulties. Now Shaw is confident that Cuddles will change his life for the better.

Why didn’t Shaw want to choose a dog as his guide (No more than 15 words)

题型:选择题

在z轴上到点A(1,0,2)与点B(1,-3,1)的距离相等的点的坐标是(  )

A.(-3,0,0)

B.(0,3,0)

C.(0,0,-3)

D.(0,0,3)

题型:选择题

关于MODS的防治原则,错误的是

A.鼓励患者及早经口摄食

B.提高饮食中芳香族氨基酸的比例

C.正确及时使用有效抗生素

D.酌情使用小分子抗氧化

E.适当使用炎症介质的阻断剂和拮抗剂

题型:选择题

所谓电子信号的频率就是信号的循环时间,即电子信号在两个事件或循环之间的时间。

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