问题
多项选择题
用于焊接压力容器主要受压元件的碳素钢和低合金钢，其碳的质量分数不应（）
A.小于0.25％
B.大于0.30％
C.小于等于0.30％
D.等于0.25％
答案
参考答案：B, C
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用于焊接压力容器主要受压元件的碳素钢和低合金钢，其碳的质量分数不应（）
A.小于0.25％
B.大于0.30％
C.小于等于0.30％
D.等于0.25％
参考答案：B, C
| 补全对话。 | |
| A: Did you hear about the flood in Wuhan last night? B: No. 1 A: My e-friend Lin Tao told me about it. It rained for a long time. B: 2 A: For half a month. B: 3 A: Yes, it was very terrible. There was water all around his house. The furniture and his books get wet. B: 4 Did your e-friend still live in his house? A: No. 5 There was no flood there because his uncle lives far away.
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