题干
I _________ an old photo while tidying my study, which reminded me of my happy childhood
A：came acro
B：came about
C：turned around
D：turned into
答案(点此获取答案解析）
A
，斜面的倾角为
，则斜面对三棱柱的支持力与摩擦力的大小分别为（）