【单选题】Which of the following cannot generate a Poisson distribution?
A.
The number of children watching a movie
B.
The number of telephone calls received by a switchboard in a specified time period.
C.
The number of customers arriving at a petrol station on Christmas day.
D.
The number of bacteria found in a cubic yard of soil.
【单选题】对称三相电路中,负载有三角形连接,也有 。
【单选题】下列关于数据电文的说法不正确的是( )。
A.
数据电文可以是以电子、光学、磁或者类似手段生成、发送、接收或者储存的信息
C.
数据电文的实质是电子光磁等手段或者其他具有类似功能的手段的应用
D.
只要一份数据电文的内容保持完整,未被改动,对该数据电文做必要的添加并不影响其“原件”性质
【单选题】Why would a waiter combine two half-finished dishes onto one plate, if the meal isn't over yet?
A.
To indicate they need your table for new customers.
B.
To make room for new dished at the table.
C.
To let you know the dessert courses are arriving.
D.
To nudge you into ordering more dishes.
【判断题】石笼防护属永久性建筑物,有平铺式和叠铺式两种。 ( )
【多选题】企业在分配制造费用时可选用的标准有( )。
【多选题】第二次鸦片战争中,清政府在天津与( )签订了不平等条约。
【简答题】根据下列材料,请回答下列各题 This is the third month running that your delivery has been late in arriving. Our current order for stationery is already five days overdue. We have a number of valued customers who are...