皮皮学，免费搜题
登录
搜题
【单选题】
2013年4月24日，东航首次成功进行了由地沟油生产的生物航空燃油的验证飞行。能区别地沟油（加工过的餐饮废弃油）与矿物油（汽油、煤油、柴油等）的方法是A.
点燃，能燃烧的是矿物油
B.
测定沸点，有固定沸点的是矿物油
C.
加入水中，浮在水面上的是地沟油
D.
加入足量氢氧化钠溶液共热，不分层的是地沟油
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Ever since the first nuclear power stations were built, doubts have ________ about their safety.
A.
preserved
B.
survived
C.
suspended
D.
lingered
【简答题】Work has been (pile)__________ up ever since the first day.
【单选题】Ever since the first nuclear power stations were built , doubts have ________ about their safety. ( 2006.12 六级)
A.
preserved
B.
survived
C.
suspended
D.
lingered
【简答题】Section B TV Linked to Lower Marks A) The effect of television on children has been debated ever since the first sets were turned on. Now three new studies find that too much tube time can lower test ...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
