题型:填空题 已知用作相对原子质量标准的一种碳原子的质量为1.993×10-26 kg ,一种铁原子的质量为9.288×10-26 kg ,则这种铁原子的相对原子质量为______________。若某原子的质量是上述碳原子质量的11.42 倍,则该原子的相对原子质量为________________。 查看答案
题型:填空题 Mo Yan said he would never forget those years ________ he lived in his hometown with his family, ________ has a great effect on his life.A.when; thatB.that; whichC.which; whoD.when; which 查看答案
题型:填空题 离子晶体熔点的高低决定于晶体中阳离子与阴离子之间的静电引力,静电引力大则熔点高,引力小则反之。试根据你学到的电学知识,判断KCl、NaCl、CaO、BaO四种晶体熔点的高低顺序[ ]A. KCl>NaCl>BaO>CaOB. NaCl>KCl>CaO>BaOC. CaO>BaO>NaCl>KCl D. CaO>BaO>KCl>NaCl 查看答案