发生炉炉煤气一氧化碳含量是（）%，所以极具危险性。A、23~30 B、27~31 C、5 发布时间：2019-03-06 16:22 │ 来源：www.tikuol.com 题型：单项选择题 问题： 发生炉炉煤气一氧化碳含量是（）%，所以极具危险性。A、23~30B、27~31C、50~65D、60~64
题型：单项选择题 任务型阅读。 In Cities in the USA, there are clocks in most stores, factories, and other buildings. Radio announcers (广播员) give the correct time during the day. 1. They want to do certain things at certain times. They don't want to be late. But time is not so important to people everywhere. 2. You will find that people living there do not liketo rush. If you have an appointment (约会) with some friends, they will probably be late, 3. Even the radio programs may not begin on time. 4. In South America, many people think of a clock as a machine. 5. They don't want a clock or any machine to affect (影响) their lives so much. A. Suppose you visit a country in South America. B. They say if people do everything on time, they are letting clocks control (控制) their lives. C. People there think that it is important to know the time. D. The radio announcers don't think it is important to announce the exact time. E. They don't want to arrive on time. 查看答案
题型：单项选择题 把足量的稀硫酸加入到盛有少量铜和氧化铜的混合物的试管里，加热，过滤，在滤纸上残留的物质是______，滤液里的溶质是______．若原混合物的质量为M克，滤纸上残留物的质量为N克，则混合物中氧化铜的质量分数为______，滤液中生成物的质量为______． 查看答案
题型：单项选择题 关于肿瘤的治疗哪项不正确（）A.良性肿瘤一般以外科治疗为主B.细胞分化程度较好的恶性肿瘤常采用手术治疗C.位于颌面深部或近颅底的肿瘤，首先考虑放疗或化疗D.唇癌或面部皮肤癌首选放疗或化疗E.颌骨肿瘤一般以手术治疗为主 查看答案