【单选题】
_________ people have a photographic memory.
【单选题】
Rowland Hill was the first to_________ a proposal to use stamps.
【单选题】
Why has jogging become so popular? Because jogging is a very_________ exercise.
【单选题】
Your long-term memory_________ everythingthat you remember.
【多选题】
在长期中,下列成本中哪些是存在的( )
【判断题】
n维单位向量组<img class=jc-formula data-tex={ \E }_{ 1 },{ \E }_{ 2 },\cdots { \E }_{ n } src=https://huaweicloudobs.ahjxjy.cn/61A18AF2058D58BB2E93C4E167BF37FB.png style=vertical-align: middle;/>线性无关