C:标准状况下,11.2 L Cl2通入足量的石灰乳中制备漂白粉,转移的电子数为NA
A:46gNO2和N2O4的混合物中含有的原子总数一定是3NA
B:500℃、30MPa下:N2(g)+3H2(g)2NH3(g)△H=-38.6kJ·mol-1;将1.5NA的H2和过量N2在此条件下充分反应,放出热量19.3kJ
D:1 mol SiO2晶体中,Si-O键的数目为2NA
vegetable,opposite,because,get,go
Jim's grandparents live in a black building.____the building is a bus station.Jim always____off the bus there when he comes to see his grandparents.Between the station and the building is a busy street.____down the street three hundred metres and turn right,there is a big market.Jim's grandparents usually buy fruit,meat and____there.Now they are buying beef there.They like living there____it's easy for them to buy what they need and go out.
唐代的衣食住行时尚有哪些特点( )
①不同民族、地区的饮食习惯融入中原文化②饮茶风俗风靡全国
③妇女社会地位不高,不允许骑马出行④流行胡服
小明做了观察唾液淀粉酶的消化作用实验,请你帮他回答问题:
试管
加入物质
控制条件
检验方法
1号
馒头碎屑+2mL唾液
37℃水溶10分钟
加两滴碘液
2号
馒头碎屑+2mL清水
子女与父母的亲情,不会因家境状况的好坏、父母地位的高低或者父母的某种生理缺陷而改变。这说明()