在工作原理上,无线网卡主要由哪些功能模块组成?()
A.NIC网卡单元
B.CF
C.天线
D.扩频通信机
参考答案:A, B, D
阅读短文,判断正(√)误(×)。
Mike: Mom, where are my glasses (眼镜)?
Mom: Are they on the desk?
Mike: No, they aren't.
Mom: Are they on the bed?
Mike: No, I can't see them (它们).
Mom: Look, they are in your hand.
Mike: Oh, yes, thanks, mom.
( ) 1. Mike is looking for (正在找) his glasses.
( ) 2. Mike's glasses are on the desk.
( ) 3. Mike can't see his glasses on the bed.
( ) 4. Mike's glasses are on the bed.
( ) 5. Mike is a careless (粗心) boy.
正常人体内环境的理化特性经常保持何种状态 ( )
A.固定不变
B.相对恒定
C.随机多变
D.绝对平衡
E.在一定时间内绝对不变