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【单选题】
关于含碳量的影响,以下哪些说法是错误的?
A.
含碳量高低会不仅影响铁碳合金组织成分，还影响合金的力学性能和工艺性能。
B.
含碳量增加会使碳钢硬度增加，切削加工性能下降。
C.
一般来说，含碳量增加会使碳钢强度和硬度增加，塑性和韧性下降。
D.
降低含碳量能使碳钢韧性增加，从而改善碳钢的锻造性和焊接性
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【单选题】Chinese netizens (网民) are more likely to use the Internet for social contact reasons,so they use blogs and chatting rooms on a larger_____
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A.
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which
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脏开始收缩时，二尖瓣前叶处于最低位置
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