— A homeless man found treasure in the mountain. He became rich over night.
—_______.
A:Every dog has its day
B:The early bird catches the worm
C:Many hands make light work
D:Actions speak louder than words
已知△ABC与△A1B1C1的相似比为2:3,△A1B1C1与△A2B2C2的相似比为3:5,那么△ABC与△A2B2C2的相似比为____
2016年8月16日,全球首颗____“实验卫星”在酒泉卫星发射中心发射,这在世界上首次实现了卫星和地面之间的量子通信,构建了一个天地一体化的量子保密通信与科学实验体系。( )
下列能分泌消化酶种类最多的消化液的腺体是