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Acrylonitrile-butadiene rubber (NBR) and Fluoroelastomers have excellent resistance to oil, kerosene, and gasoline.

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男性，56岁。7654|-缺失，余留牙健康。可摘局部义齿的支点线应设计成

A. 斜线式
B. 直线式
C. 横线式
D. 纵线式
E. 平面式

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In which of the following fiber orientations, a maximum of fiber loading in composites can be achieved？

A. unidirectional B．Bidirectional C．Multidirectional D．Random

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甲企业为增值税一般纳税人，适用增值税税率为l7％。2013年1月销售商品1000件，每件商品不含增值税的售价为10元。企业给予购货方5％的商业折扣并开具了增值税专用发票。该企业应确认的商品销售收入为（）元。

A. 10000
B. 11115
C. 11700
D. 9500

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Which statement is false concerning the objectives of applying coupling agent onto fiber？

A. To protect the fiber surface from damage and bind fibers together for ease of processing.
B. To lubricate the fibers for less abrasion during subsequent processing operations.
C. To impart thermal and electric conductivity.
D. To provide a chemicallink between the fiber surface and the matrix and improve the bonding at the interface.

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