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What does the passage mainly discuss

A. The detail seen through a microscope.
B. Sources of illumination for microscopes.
C. A new kind of microscope.
D. Outdated microscopic techniques.

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铜或镀锌钢等电位联结带的截面不应小于( )。

A. 30mm²
B. 50mm²
C. 80mm²
D. 100mm²

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The analogy drawn between the earth and a spaceship is to illustrate the idea of ______ on earth.

A. unlimited resources
B. limited resources
C. recycling
D. regeneration

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Which of the following best conveys the' idea that man has been careless and unconcerned in his relationship with nature

A. He has exploited the earth' s resources.
B. He has shown little understanding of nature' s ways.
C. He has abused the earth' s resources.
D. He has not appreciated nature' s beauty and benefits sufficiently.

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我国很多政府大型项目的采购所使用价格为( )

A. 开标价格
B. 拍卖价格
C. 现货价格
D. 参考价格

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What does the passage mainly discuss

A. The detail seen through a microscope. B. Sources of illumination for microscopes. C. A new kind of microscope. D. Outdated microscopic techniques.

铜或镀锌钢等电位联结带的截面不应小于( )。

The analogy drawn between the earth and a spaceship is to illustrate the idea of ______ on earth.

Which of the following best conveys the' idea that man has been careless and unconcerned in his relationship with nature

我国很多政府大型项目的采购所使用价格为( )

A. The detail seen through a microscope.
B. Sources of illumination for microscopes.
C. A new kind of microscope.
D. Outdated microscopic techniques.