单项选择题 斜坡变形的基本形式主要有拉裂松动和蠕动,破坏的基本形式有崩塌、滑坡和流动。 A、正确 B、错误
未知题型 What does the author think of America's large body of family laws governing children's welfare?A.They fail to ensure children's healthy growth.B.They fail to provide enough support for parents.C.They emphasize parents' legal responsibilities.D.They impose the care of children on parents.
单项选择题 ()外部中断 0 允许中断的 C51语句为 ______。 A. RI=1 B. TR0=1 C. IT0=1 D. EX0=1