A:We can climb the tree.
B:We can't climb the tree.
AB是圆O的直径,点C,D都在圆O上,连接CA,CB,DC,DB.已知∠D=30°,BC=3,则AC的长是____ .
There isn't ______ juice in the fridge. Would you like ______ coffee?
下列有关化学实验的说法正确的是( )
甲、乙、丙三名射击运动员在某场测试中各射击20次,3人的测试成绩如下表,则甲、乙、丙3名运动员测试成绩最稳定的是()