下列反应中,既属于氧化反应又属于化合反应的是____
A.CH4+2O2CO2+2H2O B.2H2+O22H2O
C.Na2CO3+Ca(OH)2═CaCO3↓+2NaOH D.____ .
为了了解某校初三年级500名学生的体重情况,从中抽查100名学生体重进行统计分析,在这个问题中,总体是指 ( )
下列旅游景点与其所在的国家组合错误的是( )
右边漫画的寓意是()①强意志是战胜困难、克服弱点、取得成功的保证;②意志薄弱者,会在挫折和失败而前退缩,不易成功;③做事不能善始善终,会丧失成就人生的良机;④意志品质有强弱之分,要磨砺坚强意志
My new Chinese teacher is Miss White. She is funny and kind. Her favourite food is salad because it is fresh and healthy. She can sing English songs and play the guitar. There is a lake in front of her house. Behind the house, there is a mountain. So she often climbs the mountain and plays some sports on the weekend. I like my Chinese teacher.