试题与答案

河南省简称(),省会所在地是郑州。

题型:填空题

题目:

河南省简称(),省会所在地是郑州。

答案:

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参考答案:在第三拉拔剪切位置截取150mm左右管子,用手锯锯掉两头,取用100mm左右,去除毛刺,将管内铜屑清理干净待检。外径测量:外径千分尺测量联拉管外径,同一截面对称取8点进行测量取平均值,要求tmax—tmin...

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题型:单项选择题


In this section you will find after each of the passages a number of questions or unfinished statements about the passage, each with 4 (A, B, C and D) choices to complete the statement. You must choose the one which you think fits best. The time for this section is 75 minutes.

questions 1-5 are based on the following passage.
Non-indigenous (non-native) species of plants and animals arrive by way of two general types of pathways. First, species having origins outside the United States may enter the country and become established either as free-living populations or under human cultivation-for example, in agriculture, horticulture, aquaculture, or as pets. Some cultivated species subsequently escape or are released and also become established as free-living populations. Second, species of either US or foreign origin and already within the United States may spread to new locales. Pathways of both types include intentional as well as unintentional species transfers. Rates of species movement driven by human transformations of natural environments as well as by human mobility-through commerce, tourism, and travel-greatly exceed natural rates by comparison. While geographic distributions of species naturally expand or contract over historical time intervals (tens to hundreds of years), species-ranges rarely expand thousands of miles or across physical barriers such as oceans or mountains.
Habitat modification can create conditions favorable to the establishment of non-indigenous species. Soil disturbed in construction and agriculture is open for colonization by non-indigenous weeds, which in turn may provide habitats for the non-indigenous insects that evolved with them. Human-generated changes in fire frequency, grazing intensity, as well as soil stability and nutrient levels similarly facilitate the spread and establishment of non-indigenous plants. When human changes to natural environments span large geographical areas, they effectively create passages for species movement between previously isolated locales. The rapid spread of the Russian wheat aphid to fifteen states in just two years following its 1986 arrival has been attributed in part to the prevalence of alternative host plants that are available when wheat is not. Many of these are non- indigenous grasses recommended for planting on the forty million or more acres enrolled in the US Department of Agriculture Conservation Reserve Program.
A number of factors perplex quantitative evaluation of the relative importance of various entry pathways. Time lags often occur between establishment of non-indigenous species and their detection, and tracing the pathway for a long-established species is difficult. Experts estimate that non-indigenous weeds are usually detected only after having been in the country for thirty years or having spread to at least ten thousand acres. In addition, federal port inspection, although a major source of information on non-indigenous species pathways, especially for agriculture pests, provides data only when such species enter via closely-examined routes. Finally, some comparisons between pathways defy quantitative analysis-for example, which is more "important": the entry path of one very harmful species or one by which many but less harmful species enter the country

Which of the following statements about species movement is best supported by the passage

A.Human factors affect species movement rates more than its long-term amount.

B.Natural expansions of species account for their slow natural contractions.

C.Natural environments created by human activities contribute much to species movement.

D.Long-range movement of species depends on the geographic extent of human mobility.

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题型:单项选择题

某甲向银行取款时,银行工作人员因点钞失误多付给1万元。甲以这1万元作本钱经商,获利5000元,其中2000元为其劳务管理费用成本。1个月后银行发现了多付款的事实,要求甲退回,甲不同意。下列有关该案的哪一表述是正确的( )

A.甲无需返还,因系银行自身失误所致

B.甲应返还银行多付的1万元

C.甲应返还银行多付的1万元,同时还应返还1个月的利息

D.甲应返还银行多付的1万元,同时还应返还1个月的利息及3000元利润

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