A:a; an; the
B:a; /; the
C:an; an; the
D:/; an; /
读等值线分布图,图中数值a>b>c,下列叙述正确的是( )
科学家研制出以锶原子为钟摆的“晶格钟”成为世界上最精准的钟.锶元素在元素周期表中的信息与锶原子结构示意图如图所示,下列说法错误的是( )
About seven item of information can ____ ____ at a time by short-term memory.
Today is my birthday. I am a girl. My name is Han Mei. I'm nine years old. I have a birthday party. I have a birthday cake and many gifts. My father and my mother say“Happy birthday!”to me. I'm very happy.