轻度吸入性损伤（）。 A.病变仅限于口、鼻腔和咽部 B.呼吸性碱中毒 C.病变累及支

抽样误差：

在一定条件下，将2molX和3molY 充入一密闭容器中，发生如下可逆反应： nX(g)+3Y(g) 2Z(g) 达到平衡时，X的转化率为a%，Y的转化率为b%，若a<b，则n的值为 [ ]

A．1 　

B．2 　 　

C．3 　

D．4

资本资产定价模型反映了风险与要求的收益率之间的均衡关系。在资本资产定价模型中，β系数是重要的因素，其表示的内容是( )。

A．某项资产的总风险
B．某项资产的非系统性风险
C．某项资产期望收益率的波动程度
D．某项资产收益率与市场组合之间的相关性

下列有关选择柴油机润滑油粘性的述说，正确的是（）

①冬季选用粘度稍低的润滑油，夏季选用粘度稍高的润滑油

②磨损较大的旧柴油机选用粘度较低的润滑油

③粘度和标号相联系近的汽油、机油与普通柴油、机油、必要时可以互相代用

A.①②

B.②③

C.①③

D.①②③

During recent years we have heard much about "race": how this race does certain things and that race believes certain things and so on. Yet, the (51) phenomenon of race consists of few surface indications.

We judge race usually from the coloring of the skin: a white race, a brown race, a yellow race and a black race. But (52) you were to remove the skin you could not tell anything about the race to which the individual belonged. There is nothing in physical structure, the brain or the internal organs to (53) a difference.

There are four types of blood. All types are found in every race, and no type is distinct to any race. Human brains are the (54) . No scientists could examine a brain and tell you the race to which the individual belonged. Brains will (55) in size, but this occurs within every race. (56) does size have anything to do with intelligence. The largest brain ever examined belonged to a person of weak (57) . On the other hand, some of our most distinguished people have had (58) brains.

Mental tests which are reasonably (59) show no differences in intelligence between races. High and low test results both can be recorded by different members of any race. (60) equal educational advantages, there will be no difference in average standings, either on account of race or geographical location.

60().

A.Provided 

B.Concerning 

C.Given 

D.Following