21 N 化学特点
综合性能较好，冲击强度较高，化学稳定性,电性能良好。
与372有机玻璃的熔接性良好，制成双色塑件，且可表面镀铬，喷漆处理。
有高抗冲、高耐热、阻燃、增强、透明等级别。
流动性比HIPS差一点，比PMMA、PC等好，柔韧性好。
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详细说明：African countries where t hey speak French." She tried to imagine herself conversing with the natives in some arid African village while balancing a clay pot of fresh goat's milk on her head and wearing an elaborately dyed caftan that could be supremely sexy if tied in the right places. She'd have a killer tan and would be nothing but muscle and bone from all the hard work and horrible intestinal diseases. Children would clamor at her knees for the Godiva chocolates she'd order for them and she'd smile sincerely down at them like a beautiful, unwrinkled Mother Teresa. When she returned to the States she'd win some Peace Corps award for best volunteer, or even the Nobel peace Prize. She'd have dinner with the president, who would write her a recommendation to
