The United States ranks () in the world in the total value of its economic production.
A. first
B. second
C. third
D. fourth
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试述OEM生产模式是如何使OEM厂商和EMS厂商实现双赢的。
A-dealer B-promising C-moderately D-insurance E-freight F-enclose G-illustrated H-by separate post I-irrevocable L/C J-place K-prompt shipment L-invite M-standing credit N-reference O-firm ( )邀请 ( )封人
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