( 18) . __----I’m 1.60 meters()
A.How heavy are you
B.How old are you
C.How tall are you
C、How tall are you
A.How heavy are you
B.How old are you
C.How tall are you
C、How tall are you
试求图示梁C点挠度,已知Fp=9000N,q=15000N/m,梁为18号工字钢, I=1660cm¿33 34¿
W: No, I'm not sure I'm going to.
M: There's not much time left. The deadline's May 1. That is just two weeks from now. Are you short of cash.
W: No, I'm Okay.
M: You'd better hurry up if you want a dorm room next September. There aren't enough rooms for every one, and first-year students have priority.
W: Well, I've been thinking about living off campus.
M: Have you any idea how much that would cost? There is the rent, utilities, and you'd probably need a car.
W: I know it would be more expensive. I think I can handle it though. The dorm is just so noisy that I can't get anything done. Maybe my grades would be better if I had some peace and quiet in a place of my own.
M: You should study in the library the way I do. Think of the money you'd save.
W: I've got to think it over some more. There's still two weeks left in April.
(23)
A.When to move.
B.Where to live the following year.
C.How much time to spend at home.
D.Whose house to visit.
Then one evening,after he had looked through the straw and emptied the factory worker's pockets (17) usual,he said to him,“Listen,I know that you are smuggling things (18) this frontier. Won't you tell me what it is that you're bringing into the country so successfully? I'm an old man,and today's my last day on the job. Tomorrow I'm going to (19) . I promise that I shall not tell anyone if you tell me what you've been smuggling. ”The factory worker did not say anything for (20) . Then he smiled,turned to Henry and said quietly:“Bicycles. ”
A. should
B. might
C. would
D. must
回答下列问题
1.写出Fe (II) 和I在溶液中的反应现象和反应方程式。
2.有足量FT时,Fe (I)不和I反应。请说出原因。
3.往1.的溶液中加足量F,有什么现象?原因何在。
4.在足量2mol/dm3 HCI溶液中加Fe (II)、I、F。请说出反应现象,它可能和实验2的现象有何不同?
已知随机变量X1和X2的概率分布分别为
且P{X1X2=0}=1.
(I)求(X1,X2)的概率分布
(II)X1和X2是否独立