题干
Is it with its charming scenery and a unique culture ________ Lugu Lake impresses people from all over the world?
A：where
B：which
C：that
D：why
答案(点此获取答案解析）
C
夹角为53°，则手受到的拉力和脚受到的作用力分别为（设手和脚受到的力的作用线或作用线的反向延长线均通过重心O，g=10m/s2.sin53°=0.8）