下列实验操作中,正确的是 A.稀释浓硫酸 B.蒸发食盐水 C.量取35mL液体

题型:选择题

问题:

下列实验操作中,正确的是

                       

A.稀释浓硫酸

B.蒸发食盐水

C.量取35mL液体

D.测定空气里氧气的含量

考点:测容器—量筒称量器—天平加热器皿—酒精灯常见仪器和装置的用途
题型:选择题

睾丸中能够产生精子的结构是()

A.精曲小管

B.精直小管

C.间质细胞

D.睾丸小隔

E.睾丸纵隔

题型:选择题

如图所示,支杆AB的长度都一样,B端均用铰链固定,一绳系住A端,另一绳悬挂重物,且重物都是G,杆重不计,那么杆AB受力最小的是(  )

A.

B.

C.

D.

题型:选择题

核苷(nucleoside)

题型:选择题

2012年4月,某市要建设一座大型公共图书馆,由当地市财政全额投资。关于该项目投资管理,下面说法正确的是( )

A.可不进行审批
B.必须进行审批
C.只进行项目核准即可
D.只进行项目备案即可

题型:选择题

Personality is to a large extent inherent. A-type parents usually (1) A-type offspring. But the environment must also have a profound effect (2) if competition is important to the parents, it is (3) to become a major factor in the lives of their children.

One place where children (4) A characteristics is school, which is, (5) its very nature, a highly competitive institution. Too many schools (6) the "win at all costs" moral standard and measure their success by sporting achievements. The current (7) for making children compete against their classmates or against the (8) produces a two-layer system, in which competitive A types seem in some way better than their B type fellows. Being too (9) to win can have dangerous consequences: remember that Pheidippides, the first marathon runner, (10) dead seconds after saying. "Rejoice, we conquer!"

(11) the worst form of competition in schools is the disproportionate emphasis on examinations. There is, for example, a (12) school that allows pupils to concentrate on those things they do well. The (13) of competition by examination are somewhat questionable, but competition in the certain (14) of failure is positively harmful.

(15) , it is neither practical nor desirable that all A youngsters change into B’s. The world needs types, and schools have an important duty to try to (16) a child’s personality to his possible future employment. It is top management.

If the preoccupation of schools with academic work was (17) , more time might be spent teaching children surer values. Perhaps selection (18) the caring professions, especially medicine, could be made less by good grades in chemistry and more by such (19) as sensitivity and sympathy. It is surely a mistake to choose our doctors exclusively from A type stock. B’s are important and should be (20) .

2()

A.when

B.since

C.although

D.and

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