— Do you think I should wear an orange shirt today?
— Yes. orange can bring you good luck, it is good for your interview.
若全集U=R,集合A={x|0<x<2},B={x|x﹣1>0},则A∩∁UB=( )
伽利略在教堂做礼拜时,发现了悬挂着的吊钟,在摆动时具有
____ 性,根据这一性质制成了测量时间的钟表.现在人们常用的计时工具是
____ 、____ .