核能是可持续发展的能源吗?()
A、是
B、不是
C、不确定
参考答案:A
I don’t understand _________ that everything’s fine when it’s not.
A.how can he say
B.can he say how
C.he can say how
D.how he can say
IP地址块222.125.80.128/26包含了(1)个可用主机地址,这些可用地址中最小的地址是(2),最大地址是(3)。
3()
A.222.125.80.128
B.222.125.80.190
C.222.125.80.192
D.222.125.80.254