问题
多项选择题
对于含碳量低于0.8%的钢，含碳量越多，钢的（）越下降。
A.强度
B.冲击韧性
C.塑性
D.耐腐蚀稳定性
答案
参考答案：B, C, D
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对于含碳量低于0.8%的钢，含碳量越多，钢的（）越下降。
A.强度
B.冲击韧性
C.塑性
D.耐腐蚀稳定性
参考答案：B, C, D
Kate played with her Aunt Jane at the beach. It was a beautiful day. Kate built a big sand castle(沙城堡) in the morning. Aunt Jane 36 many pictures of the castle to send to Kate’s parents. Kate wanted to 37 again on the beach that afternoon. She wanted to build 38 sand castle. Aunt Jane told her it was too 39 . Aunt Jane said Kate could only go if she had a 40 . But Kate didn’t have one. Aunt Jane agreed that Kate could take one of hers. Kate tried 41 three hats. The pink one was really 42 with long ribbons(丝带) but that would not be good for building a sand castle. The red hat with flowers on it was nice. But Kate was 43 the flowers would get dirty. Then, Kate 44 a big straw hat(草帽) with a short red ribbon on it and it would be easy to clean. 45 Kate put it on and went to the beach.
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