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【简答题】
画出液控单向阀锁紧回路,标出液压元件职能符号,写出工作原理。 2 画出行程控制的多缸顺序动作回路,标注液压元件职能符号,写出工作原理。
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反馈参考答案：
举一反三
【单选题】Students in the U．S．usually do badly on exams in _________ ．
A.
January
B.
December
C.
August
D.
May
【简答题】发动机烧机油时,排气颜色为 。
【单选题】What the teacher and the students want to say _____ that either of the countries ____ beautiful.
A.
are, are
B.
is, is
C.
are, is
D.
is, are
【单选题】According to the passage, which of the following is NOT true?
A.
Foreign students if they are permanent residents in the U.S. can receive government assistance.
B.
Foreign students with I-20 visa cannot receive government assistance.
C.
More students can receive scholarships than other types of financial aid.
D.
Students in financial difficulty can receive assistance.
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