交易费用是市场经济交换过程产生的一种费用,它不同于生产费用,具体包括()。A、事前准

题型:单项选择题

问题:

交易费用是市场经济交换过程产生的一种费用,它不同于生产费用,具体包括()。

A、事前准备合同费用

B、广告费用

C、雇佣工人的费用

D、支付原材料购买费

考点:经济学管理经济学管理经济学题库
题型:单项选择题

在有水的金属容器内作业时,照明灯的电压应为( )安全电压,并设防护罩。

A.12V

B.24V

C.36V

D.9V

题型:单项选择题

Part 4


Questions 26-45


·Read the following passage and decide which answer best fits each space.
·Forquestions26-45, markoneletterA, B, C or D on the Answer Sheet.
Both (26) and zoology are parts of a more general field of science, biology. The two are studies of (27) things, which share certain characteristics, (28) they are plants or animals. Botany deals with plants, whose organisms that can (29) their own food by the use of sunlight. Zoology on (30) hand, deals with animals, those organisms that cannot manufacture their own food and are thus dependent (31) plants for their food.
(32) plants and animals share many abilities, the extent (33) which plants can exercise some of those abilities is (34) . For example, both plants and animals need food, water, and warmth for growth, (35) plants can move to (36) those needs only by the slow extraction of their leaves and roots, while animals can move relatively (37) distances in relatively little time. When an animal is hurt with needle, the animal will (38) the part of the body (39) . This ability to draw back (40) pain or irritation, called irritability, is found only to a very limited extent in plants.
If plants (41) the same (42) as animals, animals would have had a more difficult time finding food. If animals were as limited as plants, they might (43) a means of manufacturing their own food, as plants do now. The world would be a very different place (44) it is if the characteristics of plants and animals were (45)

A.evolve

B.have evolved

C.be evolved

D.be evolving

题型:单项选择题

阿胶的功效是( )

A.补血止血

B.补血温肺

C.补血益气

D.补血行血

E.补血柔肝

题型:单项选择题

合理砂率是指()

A、在用水量及水泥用量一定的情况下,能使混凝土拌合物获得最大的流动性,且能保持粘聚性及保水性良好时的砂率值

B、使强度最高的砂率值

C、使耐久性最好的砂率值

D、混凝土拌合物获得所要求的流动性及良好的粘聚性及保水性,而水泥用量最少时的砂率值

E、使变形性能最小的砂率值

题型:单项选择题

在计算水泥混凝土初步配合比时,混凝土的耐久性通过限制()来保证。

A、单位用水量

B、最大水灰比

C、最小单位水泥用量

D、浆集比

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