Major manufacturers have been using "quality circle" with undeniable success for more them two decades.

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问题 Major manufacturers have been using "quality circle" with undeniable success for more them two decades.

选项 A、100 years
B、20 years
C、50 years
D、10 years

答案D

解析 decade“十年”，主要的生产厂商已经运用“品质循环”无可否认的成功了不止20几年。

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职称英语卫生类C级

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