在以O为圆心3cm为半径的圆周上,依次有A、B、C三个点,若四边形OABC为菱形,则该菱形的边长等于 ____ cm;弦AC所对的弧长等于 ____ cm.
下面属于高新技术产业产品的是( )
It's true that beauty does not always meet with a single, uniform standard. A person's cultural background, for example, may influence __________ he or she find attractive in others.
比一比,在组词
公 ____松 ____
结____洁____