地面温度最高时,则是()时。
A、地面热量收支差额等于零
B、地面热量收支差额小于零
C、地面热量收支差额大于零
D、地面热量收支差额不等于零
参考答案:A
As I will be away for at least a year, I'd appreciate from you now and then me how everything is
getting along. [ ]
A. hearing; tell
B. to hear; tell
C. hearing; telling
D. to hear; to tell
A 类网络是很大的网络,每个A 类网络中可以有(26)个网络地址。实际使用中必须把A 类网络划分为子网,如果指定的子网掩码为255.255.192.0,则该网络被划分为(27)个子网。
27()
A.128
B.256
C.1024
D.2048