【判断题】酒精,化学名称乙醇,是一种有机溶剂,常被作为化妆品的基础原料加入化妆品中。化妆品中添加的酒精都是经过特殊处理的专用酒精。 有皮肤学专家认为酒精是较好的消毒杀菌剂、清洁剂和去油污剂,对于油性肌肤和易生粉刺暗疮的皮肤十分有益。合理地使用酒精有利于皮肤的健康
【单选题】下列物质的化学名称、俗名及化学式相吻合的是( )
【单选题】听力原文:W: My friend chatted with me on the phone for two hours last night! M: Was it toll free? Q: What does the man imply? (15)
A.
They had so much free time to talk on the phone for that long.
B.
They talked on the phone for too long.
C.
He always talks on the phone for that long if it is toll free.
D.
He wants to know what they talked about.
【简答题】It was the last day of the final examination in a college. On the steps of the teaching building, a group of engineering students were waiting for the last exam, about which they seemed quite confiden...
【多选题】下列各组中的化学式、俗名与化学名称均一致的是( )
【简答题】The rate of infection is 36. with two hundred new measles cases from the last twenty-four hours alone. Fifty-three people have died. Four thousand cases have been recorded since...
【单选题】下列物质的化学式、化学名称和俗称相一致的是
【单选题】读课文理解句子意思,选出你认为正确的理解。 人人为我,我为人人。我觉得这一种境界是颇耐人寻味的。这里的“颇”应选( )
【简答题】我国从2011年5月1日开始实行“酒驾入刑”,饮酒后不能驾驶机动车,饮用酒的主要成分的名称是酒精,化学式是C 2 H 6 O. 试求: (1)酒精的相对分子质量. (2)酒精中碳、氢两种元素的质量比. (3)酒精中碳元素的质量分数.
【简答题】“人人为我,我为人人。我觉得这一种境界是颇耐人寻味的。”(1)为什么说这种境界“耐人寻味”?(2) 生活中你有没有感受过类似的境界?