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【多选题】
液压缸中存在空气时，会使液压缸产生 或 。为此，液压缸上要设置 装置。A.
爬行
B.
振动
C.
排气
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皮皮学刷刷变学霸
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【简答题】甲醇可作为燃料电池的原料。通过下列反应可以制备甲醇：CO ( g ) + 2H 2 ( g ) CH 3 OH ( g ) △H ＝-90.8 kJ·mol －1 在一容积可变的密闭容器中充入10 mol CO 和20 molH 2 ，CO 的平衡转化率随温度（T）、压强（P）的变化如图所示，当达到平衡状态A 时，容器的体积为20 L。 （1）该反应的化学平衡常数表达式为 。 （2）如反应开始时仍...
【单选题】The teachers made the English class consist of a ______ group of the students of similar abilities.
A.
homogeneous
B.
monotonous
C.
classified
D.
convivial
【单选题】____ to the surprise of the teachers, the naughty boy turned out to be the person who saved the dying girl.
A.
Great
B.
Very
C.
Much
D.
Rather
【单选题】With the termination of the uncertified teachers and the expected retirement of hundreds more, school system officials said they could have up to 750 vacancies this summer, which would be almost doubl...
A.
Retirement of teachers.
B.
Dismissal of uncertified teachers.
C.
Resignation of uncertified teachers.
D.
Disputes between the administration and the teachers.
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