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【单选题】
为了保证零件质量，便于加工制造，铸件有一些常见的工艺结构，他们是 （ ）。选填：1.壁厚；2.圆角；3.起模斜度；4.凸台；5.凹槽；6.倒角与倒圆A.
1,2,3,4,5
B.
2,3,4,5,6
C.
1,2,4,5,6
D.
1,2,3,5,6
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A.
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A.
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B.
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