6[单选题]
<p><span style="color: rgb(0, 0, 0); font-family: 微软雅黑, 宋体, Arial, Helvetica, Verdana, sans-serif; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; display: inline !important; float: none;">主要原材料消耗的构成，一般包括下面三个部分：构成产品或零件净重所消耗的原材料(）、非工艺性损耗</span><br></p>

A.工艺性损耗

B.自然损耗

C.保管损耗耗

D.运输损耗