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【单选题】
导致发动机曲轴主轴承的原因之一是()
A.
曲轴有裂纹
B.
轴承与轴颈配合间隙过大
C.
气缸压力过高
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参考答案:
举一反三
【单选题】听力原文:Where would you rate as the best place for a good cup of Latte around here? (A) With cream and sugar. (B) Your total comes to $4.25. (C) There's a shop around the corner. (6)
A.
B.
C.
【单选题】设x,y∈R且 x≥1 x-2y+3≥0 y≥x ,则z=x+2y的最小值等于(  )
A.
2
B.
3
C.
5
D.
9
【简答题】设x,y∈R且x+y=5,则3 x +3 y 的最小值是______.
【简答题】We are glad to welcome our Chinese friends to this special Business Training program. Here, you will have a variety of activities and a chance to exchange ideas with each other. We hope that all of yo...
【单选题】设x,y∈R且 ,则z=x+2y的最小值等于 [     ]
A.
2
B.
3
C.
5
D.
9
【简答题】设x,y∈R,且x+y=4,则5 x +5 y 的最小值是______.
【判断题】Here, the group of the series of instructions is called program.
A.
正确
B.
错误
【单选题】Mr. Baker, a dozen students want to see you. () they wait here or outside?
A.
Should
B.
Will
C.
Shall
D.
Are
【单选题】设x,y∈R,且x+y=4,则5 x +5 y 的最小值是(  )
A.
9
B.
25
C.
162
D.
50
【简答题】已知 A 与 B 两物质的相对比移值为 1.5 。当 B 物质在某薄层板上展开拮,斑点距原点 9cm ,此时原点至溶剂前沿距离为 18.0cm 时,问 A 若在此板上同时展开, A 物质的展距应为多少? A 物质的 R f 值应为多少。
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