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You should _______________ to one or more weekly magazines such as Time or Newsweek.

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.

目前使用最广泛的节流件是___和___。
目前使用最广泛的节流件是 ___ 和 ___ 。
目前使用最广泛的节流件是___和___。
目前使用最广泛的节流件是 ___ 和 ___ 。
Tables______ of stones or wood.
Without water, _________ no plants or animals.
I am wondering if they are ____ or____.
_________ in a person’s speech or writing usually ranges on a continuum from casual or colloquial to formal or polite according to the type of communicative situation.
__________ is the act performed by or resulting from saying something; it is the consequence of, or the change brought about by the utterance.
调速阀可使速度稳定,是因为其节流阀前后的压力差 ____ 。
溢流阀能使其_____压力保持恒定,减压阀能使其 ____压力保持恒定。
溢流阀安装在液压系统的液压泵出口处,其作用是维持系统压力____,液压系统过载时____。
溢流阀通常并接在液压泵的出口,用来保证液压系统的出口压力恒定时称为 ___ ;用来限制系统压力的最大值称为 ___ ;还可以在执行元件不工作时使液压泵 ___ 。
节流阀在定量泵的液压系统中与溢流阀组合,组成节流调速回路,即____ 、____、____ 三种形式节流调速回路。
与节流阀相比较,调速阀的显著特点是____。
All people, whether they be rich or poor, strong or weak, privileged or deprived,are interdependent, and _______ the common task of seeking to achieve mankinds full potential
节流阀的节流阀应尽量做成____式。
定值溢流阀可保持____稳定。
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