[名词解释] 食物链

车削用量是指（）。 ["A．切削速度","B．进给量","C．背吃刀量","D．三者都是"] 食物网 砖砌体工程的总体质量要求为（） ["A、横平竖直","B、内外搭接","C、上下错缝","D、灰浆饱满","E、接搓牢固"] 输入程序时若删除一个字节则需要按（）键。 ["A．RESET","B．HELP","C．INPUT","D．CAN"] 流砂的防治方法有（）。 ["A、水下挖土法","B、打预制桩法","C、地下连续墙法","D、抢挖法","E、人工降低地下水位法"] 食物链