电阻R1=15Ω、R2=10Ω,R1、R2并联后的总电阻是______Ω.

题型:填空题

问题:

电阻R1=15Ω、R2=10Ω,R1、R2并联后的总电阻是______Ω.

考点:电阻的并联
题型:填空题
设x、y均为正实数,且
3
2+x
+
3
2+y
=1
,以点(x,y)为圆心,R=xy为半径的圆的面积最小时圆的标准方程为______.
题型:填空题

下列关于铁剂的叙述,正确的是()

A.四环素可减少铁的吸收

B.补铁时血象恢复正常,症状好转即可停药

C.盐酸可减慢铁的吸收

D.补铁时同服牛奶可减慢铁的吸收

E.补铁时同饮茶水可减慢铁的吸收

题型:填空题

化学在社会发展中起着重要的作用.下列四个选项中化学不涉及的研究领域是(  )

A.开发新能源

B.合成新的物质

C.物质气、液、固三态互变的条件

D.防治环境污染

题型:填空题

A young man once went to town and bought himself a pair of trousers. When he got home, he went to his room and put them on. He found that they were about two inches too long. He went into the kitchen, and his mother and two sisters were doing some washing there. He said to them, “The new trousers are too long. They need cutting by two inches. Would one of you mind doing this for me?” His mother and sisters were busy and none of them said anything.

But as soon as his mother had finished washing up, she went to her son’s room silently and cut the trousers by two inches. She came back without saying anything to her daughters. After supper, the elder sister remembered her brother’s trousers. She went to his room and cut the trousers by two inches without saying anything to anyone. The younger sister went to the cinema. But when she came back, she also remembered her brother’s trousers. So she went to his room and cut them by two inches, too.

小题1:The trousers were ______.

A.too long

B.new

C.for the young man

D.A, B and C小题2:Why didn’t the young man’s mother and sisters answer him?

A.Because they didn’t hear him clearly.

B.Because they thought others would do it for him

C.Because they didn’t want to do it for him.

D.Because they were busy at that time.小题3:What can we infer from the story?

A.Maybe the young man didn’t try on the trousers when he bought them

B.The trousers are just right for the young man now.

C.His mother and sisters didn’t hear what the young man said.

D.The young’s mother and sisters didn’t want to help him.小题4:If the trousers were 197 inches at first, how long were they at last?

A.191 inches

B.193 inches

C.195 inches

D.199 inches.小题5:Which one is true from the story?

A.The young man’s mother and sisters want others to know what they did.

B.They young man would be very happy to see his trousers were short.

C.The young man had to throw the trousers away at last.

D.The young man would be very thankful to his mother and sisters.

题型:填空题

管理职能循环中最后的一环是()

A.计划工作

B.控制工作

C.领导工作

D.组织工作

E.协调工作

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