题目内容

The aim of a nuclear reactor is ______.

A. to establish a controlled chain reaction in low concentrations of fissile material
B. to absorb neutrons travelling at a particular speed
C. to cause a rapid chain reaction in order to release the greatest amount of energy
D. to last the chain reaction forever

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A．On a basis ofB．With regard toC．In the course ofD．For fear of

A. On a basis of
B. With regard to
C. In the course of
D. For fear of

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The Woman's Exhibition in 1909 met with great opposition from Parliament.

A. YES
B. NO
C. NOT GIVEN

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某公司只生产和销售一种零件，企业每月销售40000件，零售价为125元，生产成本为100元／件，为减少生产调整成本，某公司将延长该零件的生产期间，由于效率的提高估计每年可节约生产调整成本26万元，然而存货周转率将从每年8次下降为6次。如果企业的资金成本率为15%，假设不改变生产成本，则公司应实施新的生产计划。()

A. 正确
B. 错误

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CaCO3与PbI2的溶度积非常接近，均为约1×10-9，下列叙述中正确的是（)。A．二者的饱和溶液中Ca2+、pb2CaCO3与PbI2的溶度积非常接近，均为约1×10-9，下列叙述中正确的是()。

A. 二者的饱和溶液中Ca2+、pb2+离子浓度接近
B. 溶液中含Ca2+与Pb2+离子的浓度相同时，逐渐加入浓度均为0.1 mol/dm3的Na2CO3和NaI的混合溶液，首先沉淀的是CaCO3
C. 二者的饱和溶液中，Ca2+离子的浓度为pb2+离子的浓度的1/2
D. 二者在水中的溶解度近似相等

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The aim of a nuclear reactor is ______.

A. to establish a controlled chain reaction in low concentrations of fissile material B. to absorb neutrons travelling at a particular speed C. to cause a rapid chain reaction in order to release the greatest amount of energy D. to last the chain reaction forever

A．On a basis ofB．With regard toC．In the course ofD．For fear of

The Woman's Exhibition in 1909 met with great opposition from Parliament.

CaCO3与PbI2的溶度积非常接近，均为约1×10-9，下列叙述中正确的是（)。A．二者的饱和溶液中Ca2+、pb2CaCO3与PbI2的溶度积非常接近，均为约1×10-9，下列叙述中正确的是()。

A. to establish a controlled chain reaction in low concentrations of fissile material
B. to absorb neutrons travelling at a particular speed
C. to cause a rapid chain reaction in order to release the greatest amount of energy
D. to last the chain reaction forever