A:石灰石溶于醋酸:CaCO3+2H+═Ca2++CO2↑+H2O
B:Na2C03溶液显碱性:C032﹣+H2O═HCO3﹣+OH﹣
C:过量铁屑溶于稀硝酸:Fe+4H++NO3﹣═Fe3++NO↑+2H2O
D:FeI2溶液中通入少量氯气:2Fe2++C12═2Fe3++2Cl﹣
如图所示是有关电与磁实验的装置图,能用来探究影响电流的磁场强弱因素的是( )
A. It's a cake.
B. Hello, Li Hong.
C. Thank you.
Li Hong: Hello, Gao Ling.
Gao Ling: ____
Li Hong: What's this?
Gao Ling: ____ Happy birthday to you.
Li Hong: ____
Gao Ling: You're welcome(不用客气).
日常生活中所说的“血缘关系”中的“血缘”实际是指( )