对用于油蒸气进行回收的吸附(收)剂的一般要求是既能解吸,又能再生。
参考答案:对
— You were out when I dropped in at your house.— Oh, I ____ for a friend from England at the airport.
在深度为5的满二叉树中,结点的个数为______。
A.32
B.31
C.16
D.15