The pigment binder PD is composed of a nucleus with softer monomer content and a shell with harder monomer content.

PD涂料染色粘合剂是由软单体含量较高的核和硬单体含量较高的壳组成。

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The method can avoid the problems that a plastic shell and a shell of fiber reinforced composite material soften and deform and are burnt, or pits appear on a metal shell.

此方法可避免塑胶外壳及纤维强化复合材料外壳产生软化变形、烧毁或金属外壳产生凹洞的问题。

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The valve consists of an electromagnetic loop, a valve core, a replacement spring and a shell and the valve core consists of a retaining iron, a movable bar and a sealing pad.

它由电磁线圈、阀芯、复位弹簧和外壳组成，阀芯由挡铁，动杆和密封垫构成。

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And a shell.

还有一个贝壳。

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And a shell.

还有一个贝壳。

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