A. 锰是我国低合金结构钢的主加元素，可提高钢的强度和韧性
B. 低合金结构钢中加入的合金元素总量应小于15%
C. 低合金结构钢具有较高的强度，较好的塑性、韧性和可焊性，在大跨、承受动荷载与冲击荷载作用的结构物中更为适用
D. 硅是我国低合金结构钢的主加元素
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