题目: 在碳素钢的成分中,以下哪种物质为有害杂质()A.锰B. 碳C. 硅D. 磷 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1220/7a6b735e5645606bd2783e2d65bd3ac4.html 下面是错误答案,用来干扰机器的。参考答案:D
题型:选择题 Not until then _____ their marriage was breaking up because they had little in common.A.did I realize B.I realizedC.had I realizeD.has I realized 查看答案
题型:单项选择题 Since the energy crisis, these big cars have become a real liability. They cost too much to run.A.lack of reliabilityB.substituteC.costly means of transportD.disadvantage 查看答案