The __________ acts to slow, stop, or hold the vehicle during normal driving. They are foo...

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【单选题】

The __________ acts to slow, stop, or hold the vehicle during normal driving. They are foot-operated by the driver depressing and releasing the brake pedal.

drum brake

disk brake

service brake

parking brake

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【多选题】严谨治学的意义()

是一切学术活动的内在逻辑

是培养人才的要求

是社会发展的需要

是提高教师素质所必需

是不断提高教育质量所必需

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【判断题】在任课教师推荐的论文“论科学技术的内在亦善亦恶观及其意义”的论文中，作者认为科学技术本身并不具有善恶，是价值中立的，只有应用过程中才有善恶问题。

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【多选题】Why is ATP-driven Na + or H + important?

In the plasma membrane of an animal cell, an ATP-driven Na + pump transports Na + out of the cell against its electrochemical gradient; this Na + can then flow back into the cell, down its electrochemical gradient, through various Na + gradient-driven pumps.

The influx of Na + through these gradientdriven pumps provides the energy for the active transport of many other substances into the cell against their electrochemical gradients. If the ATP-driven Na + pump ceased operating, the Na + gradient would soon run down, and transport through Na + gradient-driven pumps would come to a halt.

For this reason, the ATP-driven Na + pump has a central role in the active transport of small molecules across the plasma membrane of animal cells.

Plant cells, fungi, and many bacteria use ATP-driven H + pumps in an analogous way: in pumping H + out of the cell, these proteins create an electrochemical gradient of H+ across the plasma membrane that is subsequently harnessed for solute transport.

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【单选题】The various pumps and lines are _____ to some extent so that each pump can act as an alternative for another.

interlocked

interconnected

interfered

interacted

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【判断题】广义的文化是指语言、文学、艺术及一切意识形态在内的精神产品。

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【单选题】山衔落日浸寒漪。