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科学的控制标准应该满足哪些基本要求？

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试比较分析前馈控制和反馈控制的优缺点？

Anytime you choose towalk, ride a bike or take public transport, you are helping to improve air quality and slow global warming.

A. 每次你选择步行、骑自行车或者乘坐公共交通工具都有助于改善空气质量并且减缓全球变暖。
B. 为了改善空气质量并且减缓全球变暖，每次你选择步行、骑自行车或者乘坐公共交通工具。
C. 每次你选择步行、骑自行车或者乘坐公交交通工具都是为了改善空气质量并且减缓全球变暖。

A gap year could help me get better prepared for college and society.

A. 间隔年能够帮助我为上大学和步入社会做更好的准备。
B. 隔断年能够帮助我为了大学和社会得到更好的准备。
C. 空档年能够帮助我准备好大学和社会。

用所给的单词填空： recyclable; reduce;grocery list;newspaper bagsHow to keep our environment clean by making an effort to (1) , reuse and recycle plastic grocery bags? Here are some tips. Tip one: hang a bag. Hang a (2) plastic bag in your kitchen to collect your recyclable plastic bags. Tip two: collect other recyclable plastic bags including, dry-cleaning bags, bread bags, (3) , and produce bags. Tip Three: write down the words, "recycle plastic bags," at the top of every (4) as to not forget to bring your recyclable plastic bags with you on your next grocery store visit.