对建筑物耐火等级检查时，需要实地查看（）。

A.建筑物的结构形式

B.各种基本建筑构件的种类

C.测量建筑构件截面尺寸

D.金属构件的防火处理

E.建筑层数

Communication protocols are (66) connection-oriented or connectionless, (67) whether the sender of a message needs to contact and maintain a dialog with the recipient or (68) send a message without any, prior connect and with the hope that the recipient receives everything. (69) .These methods (70) the two ways that communication is implemented on networks.

A．make known

B．disclose

C．reveal

D．discover