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【简答题】
某企业从供应商处采购原材料，用于生产某种产品。该企业所采购每种原材料可由多位供应商供应，每位供应商也可提供多种原材料；这些原材料主要用来生产一种产品，但该种产品需要多种材料生产。描述系统中各实体的属性。
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【简答题】Itis implied in the passage that western people at the time [A] were indifferent to the deaths ofthe civilians in an enemy country. [B] were sympathetic with the deaths ofthe Japanese civilians. [C] w...
【单选题】The topic of the passage is that __.
A.
the control of population is essential to the development of a nation
B.
natural resources are important to the economic development of a country
C.
awareness of the effects of man's actions is as important as population control
D.
developed countries should do more to protect natural environment on the earth
【单选题】下列加点字的读音全都正确的一项是
A.
．消遣(qiǎn) 教诲( huǐ ) 荒诞不经(dàn)
B.
．贮藏(zhù) 沉吟(yín) 跬步千里(guǐ)
C.
．猝然(cù) 胆怯(qiè) 不速之客(sù)
D.
．呜咽(yàn) 分歧(qí) 蓊蓊郁郁(wěng)
【简答题】设 是由方程 所确定的隐函数,求 的值
【简答题】设 都是由方程 所确定的隐函数,求
【单选题】The reason for the disappearance of glaciers in the dry valley is ______.
A.
that they've desended to the Ross sea
B.
that they've been blasted out by vicious winds
C.
the global warming trend ever since the ice age
D.
that they've been changed into gorges, sand dunes and boulders
【简答题】It appears that the Poplar to Stratford section of the DLR route wasoriginally developed to
【单选题】The passage suggests that the speed at which communication through pheromones occurs is dependent on how quickly they
A.
lose their effectiveness
B.
evaporate in the air
C.
travel through the air
D.
are produced by the body
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