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【单选题】
在气动系统中,起调压、稳压作用的阀是( )。A.
溢流阀
B.
顺序阀
C.
减压阀
D.
安全阀
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】student(sno,sname.sage,sdept) sc(sno,cno,grade) course(cno,cname,ccredit) 分组查询。求每门课程的最高分、最低分、平均分。显示课程名、最高分、最低分、平均分。
【简答题】分组查询。求每门课程的最高分、最低分、平均分。显示课程号、最高分、最低分、平均分。
【简答题】7r.mp3: Meanwhile,the Obama administration has picked a former federal prosecutor (3wds)____ ____ ____to end drug violence along the U.S.-Mexico border and slow the tide of illegal immigration.
【单选题】听力原文：W: You are going to miss your sister since she is going to get married, aren't you? M: Sure. We have never been separated since her birth, almost for twenty years. Well, she's grown up. I just ho...
A.
The woman will miss her sister.
B.
The man is going to get married.
C.
The man's sister is going to get married.
D.
The woman has separated with the man.
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