【单选题】【消耗次数：1】
物联网的核心技术是（ ）。
①
射频识别
②
集成电路
③
无线电
④
操作体系
参考答案：
复制
纠错
相关题目
【判断题】
物联网是指在无线射频识别技术（RFID）的基础上，将各种信息传感设备（射频识别装置、激光扫描器、红外感应器、全球定位系统等装置）与互联网结合起来而形成的一个巨大网络。
①
正确
②
错误
【单选题】
20世纪20年代，无线电爱好者（ ）在匹兹堡附近设立电台，同其他无线电爱好者通过电台对话并播放音乐，在无线电爱好者当中享有较大影响。
①
弗兰克·康拉德
②
戴维斯
③
马可尼
④
迈克尔·法拉第
随机题目
【单选题】
设A,B,C为三个事件，且A,B相互独立，则以下结论中不正确的是
①
若P(C)=1，则AC与BC也独立.
②
若P(C)=1，则<img class=jc-formula data-tex=A\cup C src=https://huaweicloudobs.ahjxjy.cn/ECFBDDF24996917EA300075A2EF96068.png style=vertical-align: middle; width: 56px; height: 20px; width=56 height=20/>与B也独立.
③
若P(C)=0，则<img class=jc-formula data-tex=A\cup C src=https://huaweicloudobs.ahjxjy.cn/ECFBDDF24996917EA300075A2EF96068.png width=56 height=20 style=font-family: 宋体; font-size: 14px; white-space: normal; vertical-align: middle; width: 56px; height: 20px;/>与B也独立.
④
若<img class=jc-formula data-tex=C\subset B src=https://huaweicloudobs.ahjxjy.cn/5AF7C06E7D78B9242171900D637B5C9F.png style=vertical-align: middle; width: 51px; height: 23px; width=51 height=23/>，则A与C也独立
【单选题】
设A,B为两随机事件，且A<img class=jc-formula data-tex=\supset src=https://huaweicloudobs.ahjxjy.cn/37A4B3C430EFA04CF480D02C0DFECE89.png style=vertical-align: middle; width: 20px; height: 17px; width=20 height=17/>B，则下列式子正确的是
①
P(A<img class=jc-formula data-tex=\cup src=https://huaweicloudobs.ahjxjy.cn/9BD598E68F21E65385221B2250659C3A.png style=vertical-align: middle; width: 22px; height: 14px; width=22 height=14/>B) = P(A)
②
P(AB)=P(A)<img width=99 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>
③
P(B|A)=P(B)
④
P(B-A)=P(B)-P(A)<img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>
【单选题】
设<img src=https://huaweicloudobs.ahjxjy.cn/044358115371A01359D17139122ECBCA.png title=4HLX6P8]}I`9_~4~SXU0NKO.png alt=4HLX6P8]}I`9_~4~SXU0NKO.png style=white-space: normal;/>的一个原函数，且<img src=https://huaweicloudobs.ahjxjy.cn/D2A606CDFF44F27A45F7B9B1AC8D29F9.png title=_3([30DGZ00_8XYG~VS`SK7.png alt=_3([30DGZ00_8XYG~VS`SK7.png style=white-space: normal;/>为奇函数，则<img src=https://huaweicloudobs.ahjxjy.cn/B1EF4D45BB73E79FB3629A58EB3ED0C5.png title=[4B}0%TF4S_IH(RC)J%V]M4.png alt=[4B}0%TF4S_IH(RC)J%V]M4.png style=white-space: normal;/>是（ ）
①
奇函数
②
偶函数
③
非奇非偶函数
④
不确定
【单选题】
It wasn’t until nearly a month later ___ I received the manager’s reply.
①
since
②
when
③
as
④
that
【单选题】
I remember her face but I cannot___ where I met her.
①
recall
②
remind
③
remark
④
remember
【单选题】
If my lawyer ___ here last Saturday, he ___ me from going.
①
had been; would have prevented
②
had been; would prevent
③
were; would prevent
④
were; would have prevented
【单选题】
They have no idea at all ___.
①
where he has gone
②
where did he go
③
which place has he gone
④
where has he gone