下列各种物质间的转换通过一步反应不能实现的是( ) A.CO2→CO B.Fe→

题型:选择题

问题:

下列各种物质间的转换通过一步反应不能实现的是(  )

A.CO2→CO

B.Fe→FeCl2

C.CO→CaCO3

D.CuO→Cu

考点:物质的相互转化和制备
题型:选择题

阅读理解。

Hello,

     Can you name some foods in the meat group?

     Can you tell where they come from?

     Your body is made up of millions of cells (细胞). Cells are very small.

     Your body has to make new cells in order to (为了) grow. It also has to make new cells to take the place

of the old cells that have been worn out.

     To grow, the cells need a thing called protein (蛋白质). The protein you need most comes from foods in

the meat group.

     Fruit and vegetables are plant foods. Foods in this group give your body vitamins (维生素) and minerals

(矿物质). Your body needs vitamins and minerals to grow and to stay well.

     The third food group is made up of bread. These foods come from grain. Your body gets heat and energy

(活动) from these foods. It needs a lot of energy to work and play.

     Mike is one of the best foods your body can get. It has protein, vitamins and minerals. Mike b good between

meals or with meals.

     Some foods are not listed (列入) in the four main groups. This is because you do not have to think about

eating these foods. You eat them if you eat foods from the four main foods.

1. In order to grow,your body _____.

A. some old cells are needed

B. has to make new cells

C. has to make more cells

D. needs more small protein

2. In order to grow, the cells need _____.

A. water

B. meat

C. protein

D. a cell

3. The protein comes mostly from _____.

A. food

B. vegetables

C. meat

D. milk

4. Vitamins come from _____.

A. meat

B. old cells

C. protein

D. fruit and vegetables

5. Mike has _____ in it.

A. body

B. bread

C. meals

D. minerals

题型:选择题

关于会计档案的销毁,下列说法正确的有( )。

A.会计档案保管期满需要销毁的,由本单位档案部门提出意见,会同财会部门共同审定,并在此基础上编制会计档案销毁清册

B.销毁会计档案时,可以只由单位的档案机构监销

C.各级财政部门销毁会计档案时,应当由同级审计部门派人监销

D.正在建设期间的建设单位,如果其会计档案保管期满,可以销毁

题型:选择题

如图3-349所示圆弧拱结构,当a<L/2时,下列关于拱脚A点水平推力HA的描述何项正确()

A.HA与a成正比

B.HA与a成反比

C.HA与a无关

D. HA=0

题型:选择题

《生产管理系统输变配电单线图维护审批管理规定》的适用范围是()

A.分管生产的领导

B.生技部主任

C.生技部专责

D.参与输变配电单线图维护审批流程的工作人员

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伪造货币罪的概念和特征是什么?

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