搜题
王老师:19139051760(拨打)
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第1题

Jack called the airline to ____his flight to Beijing this morning.
·improve
· believe
·confirm
· insure
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第2题

What are the essential differences ___ selling and marketing
·between
· from
· among
·for
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第3题

If a product configuratiois _______ specified and theexamined to determine whether the performance requirements are met.
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第4题

structural mechanics结构力学 （判断中英互译是否正确）
·正确
·错误
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