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交通标志设置原则？

答案

参考答案：

根据实际需要，结合具体情况合理设臵；设臵交通标志，要以保证交通畅通和行车安全为目的；交通标志应设在车辆行驶正面方向最容易看到的地方，一般在路右侧、中央分离带或车行道上方。

单项选择题

建筑钢材是在严格的技术控制下生产的材料，下面哪一条不属于它的优点

A．品质均匀，强度高
B．防火性能好
C．有一定的塑性和韧性，具有承受冲击和振动荷载的能力
D．可以焊接和铆接，便于装配
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单项选择题

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.

56().

A.Only 

B.Or 

C.Nor 

D.So
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