单选题GB/T699-1999《优质碳素结构钢》中规定:优质钢的S、P含量为()AS≤0.030% P≤0.030%BS≤0.030% P≤0.035%CS≤0.035% P≤0.030%DS≤0.035% P≤0.035%
单选题
GB/T699-1999《优质碳素结构钢》中规定:优质钢的S、P含量为()
A
S≤0.030% P≤0.030%
B
S≤0.030% P≤0.035%
C
S≤0.035% P≤0.030%
D
S≤0.035% P≤0.035%
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