砂浆用在墙体砌筑中，按所用配合材料不同而分为水泥砂浆、混合砂浆、石灰砂浆、防水砂浆以及勾缝砂浆等。
参考答案：对
He was very ____ to find his suggestion ____.
A．disappointed; to be turned down
B．disappointing; turned down
C．disappointed; turned down
D．disappointing; turning down
VRP实现ISIS路由器同时可以最多支持（）个区域地址。
A.1
B.2
C.3
D.4
