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【简答题】
图示两端球形铰支细长压杆,弹性模量 E =200Gpa 。试用欧拉公式计算其临界荷载。 ( 1 ) 圆形截面, d =30mm , l =1.2m ;( 2 )矩形截面, h =2 b =50mm , l =1.2m ;( 3 ) N o 14 工字钢, l =1.9m 。
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【简答题】阅读理解。 My name is Dan and I have two good friends, Nick and Robert. Robert and I are twelve years old. Nick is eleven. I was born on November 10th,1999. And Robert was born on September 10th. I like re...
【单选题】听力原文：M: Hi, Sue. Where have you been? W: Oh. Hi, Dan. I was just at the library. I have to hand in my biology paper tomorrow. M: Tomorrow? Oh, no. I thought it wasn't due till Monday. W: Oh. Don't wor...
A.
They' re classmates.
B.
They' re roommates.
C.
They' re cousins.
D.
They' re lab partners.
【单选题】听力原文：M: Hi, Sue. Where have you been? W: Oh. Hi, Dan. I was just at the library. I have to hand in my biology paper tomorrow. M: Tomorrow? Oh, no, I thought it wasn't due till Monday. W: Oh. Don't wor...
A.
They're classmates.
B.
They're roommates.
C.
They're cousins.
D.
They're lab partners.
【单选题】Dan: Have you ever participated in a risky sport? Kay: Yes, I like hang gliding. It's fantastic to be able to fly like a bird. Though landing is sometimes difficult, I've always felt hang gliding is q...
A.
What sports are risky?
B.
Do you ever get into some difficult situations'?
C.
Have you ever hurt yourself in an accident?
D.
Have you ever been to a sports centre?
【简答题】阅读理解。 My name is Dan and I have two brothers,Bob and Ray. We like hamburgers for lunch. Boband I like French fries, but Ray doesn't. I don'tlike eggs for breakfast, but Bob and Ray often eatthem. I li...
【单选题】听力原文：M: Hi, Sue. Where have you been? W: Oh. Hi, Dan. I was just at the library. I have to hand in my biology paper tomorrow. M: Tomorrow? Oh, no! I thought it wasn't due till Monday. W: Oh. Don't wor...
A.
They're classmates.
B.
They're roommates.
C.
They're cousins.
D.
They're lab partners.
【单选题】听力原文：M: Hi, Sue. Where have you been? W: Oh. Hi, Dan. I was just at the library. I have to hand in my biology paper tomorrow. M: Tomorrow? Oh, no! I thought it wasn't due till Monday. W: Oh. Don't wor...
A.
They're classmates,
B.
They're roommates.
C.
They're cousins.
D.
They're lab partners.
【单选题】I HAVE DANGEROUS LIST means ______.
A.
I have some dangerous cargo on board
B.
My cargo is dangerous
C.
My vessel is inclined
D.
My vessel has not been trimmed properly
【简答题】5 Dan: I have a muscular build and short ________ (blond / dark) hair.
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