新合成的一种烃,其碳架呈三棱柱体(如图所示)
(1)写出该烃的分子式 ____ 。
(2)该烃的一氯取代物是否有同分异构体 ____。
(3)该烃的二氯取代物有多少种 ____。
(4)该烃的同分异构体有多种,其中1种不能使酸性高锰酸钾溶液或Br2﹣CCl4溶液褪色,但在一定条件下能跟溴(或H2)发生取代(或加成)反应,这种同分异构体的结构简式是 ____ .
It was Children's Day yesterday, we 1the park. Our teacher was 2us.
3 many people there. Some Young Pioneers (少先队员)4 near the river.
5 sang and danced. There were some6 on the river. There was a hill
7. Some boys8 in the river. We sat under 9 apple tree with our teacher. We 10on Children's Day yesterday.
如图所示,工人利用动滑轮吊起一袋沙的过程中,做了300 J的有用功,100 J的额外功,则该动滑轮的机械效率为( )