12. 整体式型芯与模板为一个整体,其结构牢固,成型的塑件质量较好,但消耗贵重模具钢多,不便加工,主要用于形状复杂的型芯。()
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区位选择与生产成本、市场等因素有关,与生态环境无关。()
For some, the choices were as basic as which staircase to use. Others faced the ultimate moral __________ : Save yourself, or save another.
采用浮点数编码,能将实数的小数部分控制在一定的精度范围内,实数的整数部分可以精确的表示。