骨髓成为唯一造血场所的时间是() A.胚胎第8周 B.胚胎第3个月 C.胚胎第5个月

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问题:

骨髓成为唯一造血场所的时间是()

A.胚胎第8周

B.胚胎第3个月

C.胚胎第5个月

D.生后4~5天

E.生后2~5周

考点:护士护理考试专业知识儿科护理学造血系统疾病患儿的护理(二)
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火灾自动报警系统接地装置,采用共用接地装置时,接地电阻值不应大于()

A.1Ω

B.4Ω

C.10Ω

D.30Ω

题型:单项选择题

When Regina Mary' parents refused to let her get a horse ,the smart 15-year-olddidn’t sit in her room and complain. Instead she turned to a cow called Luna to make her riding dreams come true.

Hours of training ,and tons of treats later, the results are impressive: not only do the two regularly go on long rides through the southern German countryside, they can even do some difficult jumps successfully. Regina joked while sitting on her brown-and-white companion: “It’s unbelievable really , She thinks she’s a horse.”

The pairs unlikely friendship started about two years ago, shortly after Luna was born on the Mayer’s farm. They 

started off with walks in the woods. Then Mayer slowly got her cow more adapted to human contact and riding equipment.

About six months later, it was time to see how Luna would respond to a rider on her back in a competition for horses. Mayer sat in the saddle(马鞍),and all went as planned. “She was really well behaved and walked normally, but after a couple of meters, she wanted to get me off her back! You could see that she got a bit peeved.” said Mayer. 

Luna and Mayer are now soul mates, spending most afternoons together once the teen—who dreams of becoming a nurse one day—come home from school.

小题1:The underlined word “peeved” in paragraph 4 probably means ________.

A.excited

B.sorry

C.angry

D.puzzled小题2: Regina’s plan is to be ________ in the future.

A.an animal trainer

B.a horse rider

C.a farmer

D.a nurse小题3: The passage mainly talks about ________.

A.a cow performing in a horse competition

B.a German girl training a cow successfully

C.the way of gaining friendship from a cow

D.the efforts of a cow to adapt to riding equipment

题型:单项选择题

什么是露点?单片玻璃、普通中空玻璃和充气中空玻璃露点分别达到多少?

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仓储害虫

题型:单项选择题

如图所示,水平细杆上套一环A,环A与球B间用一轻质绳相连,质量分别为mA、mB,由于B球受到风力作用,环A与B球一起向右匀速运动.已知细绳与竖直方向的夹角为θ,则下列说法中正确的是()

A.B球受到的风力F为mBgtanθ

B.风力增大时,轻质绳对B球的拉力保持不变

C.风力增大时,杆对环A的支持力保持不变

D.环A与水平细杆间的动摩擦因数为

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