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【多选题】
下列关于齿轮式机油泵的叙述正确的有A.
壳体内装有一对相互啮合的主从动齿轮
B.
泵壳上有进出油
C.
泵盖上铣有卸压槽
D.
泵盖上装有限压阀以便在油压过卸压
E.
机油泵由凸轮轴驱动,与凸轮轴的转速相同压力润滑用于负荷大,动力速度高的摩擦表面
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【单选题】—I'm sorry to keep you waiting. —Oh, not al all. I ______here only a few minutes.
A.
have been
B.
had been
C.
was
D.
will be
【简答题】写出单词的过去式以及过去分词have/has____、____
【简答题】写出单词的过去式以及过去分词take ____、____
【单选题】听力原文：W: I heard on the radio that not only is it going to be super hot tomorrow but also the humidity is going way up. M: Sounds like I am going to have to find an air-conditioned place to be in. Q: W...
A.
He will search for an air-conditioner for his place.
B.
He will find a place to fix an air-conditioner.
C.
He will look for a place with air-conditioner to stay in.
D.
He will have a place for air-conditioner.
【单选题】It was not until I came here ________I realized this place was famous for not only its beauty but also its weather. (2012·湖南，30)
A.
who
B.
that
C.
where
D.
before
【简答题】写出单词的过去式以及过去分词eat ____、____
【简答题】一个三角形高不变，要使面积扩大3倍，底要扩大______倍．
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