硫能使钢材具有热脆性,高炉去硫比炼钢去硫容易,因此国家标准要求生铁中硫含量,炼钢铁(),铸造铁≤0.05%。
参考答案:≤0.07%
孙中山说:“在国内,君主可以不要,忠字是不能不要的。……为四万万人效忠,比较为一人效忠,自然是高尚得多,故忠字的道德还要保存。”对这段话中“忠”的理解最准确的是:[ ]
A.弘扬传统的忠孝思想
B.要保持忠君爱国思想
C.强调了国家民族意识
D.要有牺牲和奉献精神
根据句意和首字母提示完成单词。
1. The old man is an expert. He can r many kinds of machines.
2. My clothes seem s to Bob's because we like the same design.
3. Lisa takes a her mother almost in everything.
4. You'd better have your radio f .
5. Can you i what our life would be like without electricity?