用来击球的拍面应用一层颗粒向外的普通颗粒胶覆盖,连同粘合剂,厚度不超过() A.2毫

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问题:

用来击球的拍面应用一层颗粒向外的普通颗粒胶覆盖,连同粘合剂,厚度不超过()

A.2毫米

B.3毫米

C.4毫米

考点:体育科学乒乓球考试乒乓球考试题库
题型:单项选择题

第二节: 根据短文内容,从下面所给的A~F选项中选出能概括每一段主题的最佳选项。选项中有一项为多余项。

A. Attach more aid to weak schools.

B. Children should share the same educational rights.

C. Heavy load is supposed to be taken off the students’ shoulders.

D. Bring the industrial management of education to an end.

E. Balanced education may stop school choice.

F. Key schools and classes are unreasonable.

小题1:__________ Education should be intended to make better citizens instead of making money. Money can be earned by starting business. It’s time to abolish the industrialized education so that all the people can benefit from real education.

小题2:__________ Concrete measures should be taken to lessen the students’ heavy burden. Not empty talks but concrete and solid policies can guarantee all the students grow soundly.

小题3:__________ My parents are farmer­turned workers. I think we should be treated equally with the local children. We should have equal chances to go to both the local public schools and take the national college entrance exam rather than go back to our native places. 

小题4:__________ School choice has become a serious educational problem. To solve this problem, we must stick to the balanced development. The government should offer more support to weak schools and have the teachers exchange among all the schools.

小题5:__________ The government’s unwillingness to spend enough money on education makes key schools turn to parents for money to build new buildings and increase teachers’ income, widening the gap between key schools and common schools. Therefore, in order to realize the balance of education, the government should offer more help to weak schools.

题型:单项选择题

天然气、液化石油气(主要成分是C3~C6的烷烃)燃烧的化学方程式分别为:CH4+2O2→CO2+2H2O;C3H8+5O2→3CO2+4H2O.现有一套以天然气为燃料的炊具,欲改燃烧液化石油气,应采取的正确措施是(  )

A.两种气体的进入量都减少

B.增大空气进入量或减少液化气的进入量

C.两种气体的进入量都增大

D.减少空气进入量或增大液化气的进入量

题型:单项选择题

某同学拟用“甲醛法”测定工业产品中氯化铵的纯度(假定杂质不与甲醛反应)反应为:4NH4Cl+6HCHO→(CH26N4+4HCl+6H2O,称取1.5g该样品溶于水,加入足量的甲醛并加水配成100mL溶液.从中取出10mL,滴入酚酞再用0.1mol/L的NaOH溶液滴定,到滴定终点时消耗NaOH溶液25.00mL,该样品中氯化铵的质量分数为(  )

A.8.92%

B.89.2%

C.85.6%

D.92.3%

题型:单项选择题

序列图(sequence map)

题型:单项选择题

小肠消化吸收的重要部位:()。

A.绒毛表面的粘液层

B.微绒毛表面的细胞衣

C.吸收细胞的粗面内质网

D.吸收细胞的滑面内质网

E.小肠绒毛表面的纹状缘

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