已知下列语句:
①天是蓝的;②两点之间线段的长度,叫做这两点间的距离;③是无理数;④对角角相等,
其中是定义的有 [ ]
A.1个
B.2个
C.3个
D.4个
A
--- Excuse me. Is there a hotel ________ the hospital?
--- Yes. It’s also next to a bank, so the hotel is between the hospital and the bank.
A. across from
B. next to
C. in front of
从统计的资料看,内部攻击是网络攻击的()
A、次要攻击
B、最主要攻击
C、不是攻击源