试题与答案

搅拌站实验室在试配过程中应考虑混凝土搅拌及运输过程中混凝土热量的散失。当不满足要求时

题型:单项选择题

题目:

搅拌站实验室在试配过程中应考虑混凝土搅拌及运输过程中混凝土热量的散失。当不满足要求时应及时采取措施;混凝土罐车需采用保温材料包裹,且罐车出站后应尽快到达现场,尽量防止混凝土的热量损失;现场施工人员在混凝土浇筑过程中密切观测罐车中混凝土的温度,以保证混凝土出罐温度不低于()℃;混凝土搅拌车到场后应合理安排浇筑顺序,每车混凝土不得停滞时间过长。

A.5

B.10

C.15

D.18

答案:

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Aedes albopictus, a variety of mosquito that has recently established itself in the southeastern United States, is less widespread than the indigenous swamp mosquito. Both the swamp mosquito and A. albopictus can carry viruses that are sometimes fatal to humans, but A. albopictus is a greater danger to public health.
Each of the following, if tree, provides additional information that strengthens the judgment given about the danger to public health EXCEPT:

A.Unlike the swamp mosquito, A. albopictus originated in Asia, and larvae of it were not observed in the United States before the mid-1980’s.

B.Unlike the swamp mosquito, A. albopictus tends to spend most of its adult life near human habitation.

C.Unlike swamp mosquito larvae, A. albopictus larvae survive in flower pots, tin cans, and many small household objects that hold a little water.

D.In comparison with the swamp mosquito, A. albopictus hosts a much wider variety of viruses known to cause serious diseases in humans.

E.(E) A. albopictus seeks out a much wider range of animal hosts than does the swamp mosquito, and it is more likely to bite humans.

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