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【单选题】
关系没有合理的规范化，常常不会出现下面的异常情况A.
插入异常
B.
删除异常
C.
修改异常
D.
储存异常
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
【简答题】杂质的来源途径有哪些?杂质包括哪些种类?
【多选题】以下说法正确的是()
A.
SM1、SM2为串行口的工作方式选择位
B.
REN=1，表示允许串行接收
C.
串行口有两个缓冲寄存器(SBUF)，它们的地址是99H
D.
串行口工作方式1的数据帧格式为：1个起始位+9个数据位+1个停止位
【单选题】听力原文：M: I'm looking for some sports shoes. Can you give me some advice? W: That's what I'm here for, Sir. Could you tell me what size you take? M: Of course, 41. W: Ok, we have plenty of choices for y...
A.
Few things.
B.
Not many things.
C.
Plenty of choices.
D.
Nothing in his size.
【单选题】听力原文：M: I'm looking for some sports shoes. Can you give me some advice? W: That's what I'm here for, Sir. Could you tell me what size you take? M: Of course, 41. W: Ok, we have plenty of choice for yo...
A.
few things.
B.
not many things.
C.
plenty of choice.
D.
nothing in his size.
【单选题】— Excuse me. Do you have shoes for sports? — Yes, we have lots of shoes _______ very good prices.
A.
at
B.
with
C.
for
D.
in
【单选题】某一离散信源由0,1,2,3四个符号组成,各符号出现概率依次为1/8,1/4,3/8,1/4,且相互独立,若发送消息2021013213,则其信息量是
A.
1.91比特
B.
1.91比特/符号
C.
20.25比特
D.
20.25比特/符号
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