晶体长大过程中，要使液固界面稳定迁移，就必须使界面能量始终保持最低状态，实验表明只有两种界面：（）和（）；
参考答案：光滑界面；粗糙界面
阅读下面图示，完成短文，每空词数不限 （每空1分，共5分）
Here are the steps for___________________ hand wash!
First, wet your hand with water. Then put some soap on your hands. And lather(形成皂沫)at least 15 seconds. _________________________, rinse your hands______________________ Dry _________________________ with some paper towel or a hand dryer. Finally, please________________________ to turn the taps off with towel
面包店在晚上六点后开始对当天面包进行降价促销，每个便宜1元钱，这样花20元就可以比原价多买1个面包，设每个面包原价为x元，则由条件可列方程________.
