【简答题】某工具间管理相当差,平均为一个机械工服务就要12 min。现有5个机械工,平均每15 min有1个机械工来取工具,到达为泊松分布,服务时间为负指数分布。求: (1)工具保管员空闲的概率, (2)5个机械工都在工具间的概率, (3)系统中的平均人数; (4)排队的平均人数; (5)每个机械工在工具间的平均逗留时间; (6)每个机械工的平均排队时间。
【单选题】What's the trouble with Tom?
A.
He is going to see a doctor.
【判断题】上海是长江三角洲冲积平原的一部分。( )
【简答题】被告人黄某,男,20岁,某建筑工程队临时工。黄某与吴某等三名青年工在一库房旁干完活儿后,离吃饭还有一个多小时,为了御寒,在库房旁点了一堆火,边烤边闲聊。闲聊中,吴某见黄某瑟瑟发抖,便笑着对黄某说:“咱们这个火堆太小了,如果在那堆芦席上点一把火,那可就壮观了。不过,借你小子十个胆儿,你也不敢点。”黄某听了,二话不说,马上站起来从地上捡一把碎席片在火堆上引火,然后,跑到席堆前,将点燃的碎席片放到距席堆...
【简答题】完形填空。 Tom lives in New York. His father has a shop and his mother is a doctor. He is seven years old now, and begins __ 1 __ to school this autumn. It's far__ 2 __ from their shop and his father __ 3 ...
【简答题】完型填空。 Tom lives in New York. His father has a shop and his mother is a doctor. He is seven years old now, and begins 1 to school this autumn. It's far 2 from their shop and his father 3 him to school ...
【简答题】Listen to the conversation and tick T or F. 1. Tom didn't sleep well last night. 2. Tom has a toothache. 3. The doctor can't find Tom's problem. 4. Tom must stay in the hospital until he is well.
【简答题】Tom is __ doctor in _ big hospital.(a/an)
【单选题】( ) father is a doctor in a hospital and ( ) father is a teacher at a university.