皮皮学,免费搜题
登录
搜题
【单选题】
某数字基带传输系统总的传输特性(即发送滤波器至接收滤波器的传输特性) 如下图,其中TS是码元周期,则对该系统的描述正确的是( )。
A.
该系统存在码间干扰
B.
该系统不存在码间干扰,最高频带利用率为 1b/s/Hz
C.
该系统不存在码间干扰,最高频带利用率为 2b/s/Hz
D.
不确定
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【判断题】生物学实验室内的松香、硫磺、无机磷等是易燃易爆物固体,在一定的条件下均能引起燃烧和爆炸,必须妥善安置,对使用。
A.
正确
B.
错误
【简答题】Like most people, I was brought up to look upon life as a process of getting. It was not until in my late thirties that I made this important discovery: giving – away makes life so much more exciting....
【单选题】《安规》(热力和机械部分)规定,进入煤粉仓内必须使用安全带,安全带的绳子应缚在仓外固定物上,并至少有( )在外严密监护。
A.
二人
B.
一人
C.
三人
D.
三人以上
【简答题】减弱电离层影响的措施有哪些?
【单选题】夏季,3岁小儿突然高热,体温40℃,惊厥1次。体检:神清、面色红、咽红、心、肺、腹(-)。神经系统未见异常,最可能的诊断是
A.
高热惊厥
B.
中毒性痢疾
C.
流行性脑膜炎
D.
结核性脑膜炎
E.
脑脓肿
【单选题】夏季,3岁小儿突然高热,体温40℃,惊厥1次。体检:神清,面色红,咽红,肺、腹(一),神经系统未见异常,最可能的诊断是
A.
高热惊厥
B.
中毒性痢疾
C.
流行性脑膜炎
D.
结核性脑膜炎
E.
脑脓肿
【单选题】Like most people, I was brought up to look upon life as a process of getting. It was not until in my late thirties that I made this important discovery: giving away makes life so much more exciting. Y...
A.
the author did not understand the importance of giving until he was in late thirties
B.
the author was like most people who were mostly receivers rather than givers
C.
the author received the same education as most people during his childhood
D.
the author liked most people as they looked upon life as a process of getting
【判断题】无关刺激和非条件刺激在时间上多次结合是建立条件反射的必要条件。
A.
正确
B.
错误
【单选题】水中酚易被微生物分解和氧化,因此采样时必须在现场加保存剂固定,并在一定条件下保存,常用的方法是( )。
A.
加固体Na CO ,pH≥10,室温保存
B.
加固体NaOH,pH≥10,室温保存
C.
加固体NaOH,pH≥12,室温保存
D.
加固体Na CO ,pH≥10,4℃保存
E.
加固体NaOH,pH≥12,4℃保存
【单选题】肺、腹(-),神经系统未见异常。患儿最可能的诊断是
A.
高热惊厥
B.
中毒性痢疾
C.
流行性脑膜炎
D.
结核性脑膜炎
E.
脑脓肺
相关题目: