正确答案: B
工业上从液态空气中得到氧气的过程是化学变化
题目:下列关于氧气获得方法的叙述,错误的是( )
解析:B
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举一反三的答案和解析:
[多选题]②将铁粉和铜粉的混合物放入硝酸银溶液中,反应结束后,对剩余固体成分的判断正确的是______。
肯定有银
可能有铁
解析:AC
[单选题]60.
the most
解析:60.A【解析】从in the world可知要用形容词的最高级。
[单选题]I am a middle school student. I (11) at No.6 Middle School.our (12) is big. I (13) 0ur school.(14) begin at eight. We(15) four classes in the morning and two in (16) afternoom We study Chinese,maths, English and (17) lessons. There (18) fifty students in our class. We work (19) .We study (20) the people.( )11.
study
解析:11.A【解析】文中第一句说到“我是一名中学生”,以此推断此处应为“学习”.所以选A.
[单选题]27的立方根是( )
3
[单选题]31______.
spend