问题
选择题
---I went to the hot spring and enjoyed myself
---________.You looked tired last time I saw you.
A.I had hoped so
B.Thanks
C.I’m glad you did
D.That sounds a good idea
答案
答案:C
---I went to the hot spring and enjoyed myself
---________.You looked tired last time I saw you.
A.I had hoped so
B.Thanks
C.I’m glad you did
D.That sounds a good idea
答案:C
除去下列物质中的杂质,所选试剂和方法恰当的是( )
物 质 | 所含杂质 | 所用试剂和方法 | |
A | CaO | CaCO3 | 加稀盐酸后过滤、蒸发结晶 |
B | H2 | HCl | 通入饱和碳酸氢钠溶液后用浓硫酸干燥 |
C | NaCl | Na2SO4 | 加过量BaCl2溶液后过滤、蒸发结晶 |
D | CaCl2 | 稀盐酸 | 加过量CaCO3后过滤 |
A.A
B.B
C.C
D.D