【单选题】【消耗次数：1】
轴上零件利用（ ）定位是最方便而有效的方法。
①
轴肩
②
轴距
③
轴心
④
轴长
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【多选题】
某轴类零件的材料牌号是45，下面关于该材料叙述正确的是
①
该材料属于合金结构钢
②
该材料的含碳量在0.45%左右
③
该材料的零件常常采用的热处理方法是“调质处理”
④
该材料的抗拉强度是45Mpa
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