写出下列元素的符号或名称: (1)碳______,铜______,钙______

题型:填空题

问题:

写出下列元素的符号或名称:

(1)碳______,铜______,钙______,钠______,Ag______,Mn______,Fe______,K______.

(2)3个钠离子______,4个氯离子______,2个镁离子______.

(3)按要求回答下列问题:

5个氧原子:______,Hg:______,氮元素:______,nS:______.

考点:元素符号的意义及写法
题型:填空题

American schools begin in September after a long summer holiday.There are two terms in a school year,the first term is from September to January,and the second is from February to June.Most American children begin to go to school when they are five years old.Most students are seventeen or eighteen years old when they finish high school.

High school students take only four or five subjects(科目)each term.They usually go to the same class every day,and they have homework for every class.After class they do many interesting things.After high school,many students go to college.They can go to a small one or a large one.They usually have to give a lot of money.So many college students work after class to get the money for their studies.

小题1:Most American children go to school when they are _________ years old

A.four.

B.five .

C.six.

D.seven .小题2:High school students ______ after class .

A.do a lot of homework.

B.do many interesting things.

C.often sing songs.

D.do lots of reading.小题3:After high school , many students  _________ .

A.begin to work.

B.stay at home.

C.go to college.

D.visit their friends.小题4:Many college students work after class because _________

A.they want to get some money for their studies .

B.they don' t have anything to do .

C.their parents ask them for money.

D.their teachers ask them to do so .小题5:From the passage we know that in America a summer holiday begins in _________  .

A.January

B.September.

C.February

D.July

题型:填空题

关于劳务分包合同说法错误的是()。

A、劳务分包合同应当由双方企业法定代表人或授权委托人签字并加盖企业公章,不得使用分公司、项目经理部印章

B、劳务分包合同不得包括大型机械、周转性材料租赁

C、劳务分包合同可以包括主要材料采购内容

D、发包人、承包人约定劳务分包合同价款计算方式时,不得采用“暂估价”方式约定合同总价

题型:填空题

晶体管的β值与IC的大小有关,IC越大β值越大,而β值越大越好。()

题型:填空题

对目标规划和计划的优化实际上是( )。

A.目标控制的措施和手段

B.对目标控制效果的优化

C.对目标控制方法和原则的优化

D.作多方案的技术经济分析和比较

题型:填空题

马克思主义是一个博大精深的科学理论体系,其理论基础是()

A、剩余价值学说

B、马克思主义政治经济学

C、马克思主义哲学

D、科学社会主义

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