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简述企业定价工作的主要步骤。

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In usual marine applications, bellows joints are designed and fitted to accommodate straight line axial movement only and the associated piping requires adequate anchors and guides to prevent misalignmentAccording to the above sentence, which of the following statements is true?（）

A. The marine bellows joints are attached in the accommodation only
B. The bellows joints should be attached to anchors
C. The associated piping should be thrown into the water like as anchors
D. The connecting piping with the joints should be fixed firmly

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物资模块编码有（）位数字构成。

A. 12
B. 13
C. 14
D. 15

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哪一项不是非技术性基础工作的内容（）

A. 整理、清洁、维护各种护理仪器
B. 参与维护病区环境和秩序的管理
C. 外出请领、取送
D. 更换胃管
E. 取药、退药

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The current situation of African-Americans presents（）

A. a favorable picture
B. a negative picture
C. a mixed picture
D. an encouraging picture

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