如图13-43所示,均质细杆AB长l,质量为m,由直立位置开始滑动,上端A沿墙壁向下滑,下端B沿地板向右滑,不计摩擦。求细杆在任一位置ψ时的角速度ω、角加速度α和A、B处的约束力。
第2题
Alex__________that window because he never came anywhere nearhere yesterday.
A.mustn’t have broken
B.wouldn’t have broken
C.carl’t have broken
D.needn’t have broken.
第3题
Alex______that window because he never came anywhere near here yesterday.
A.must have broken
B.couldn't have broken
C.mustn't have broken
D.might have broken
第4题
Alex__________that window because he never came anywhere nearhere yesterday.
A.mustn’t have broken
B.wouldn’t have broken
C.carl’t have broken
D.needn’t have broken.
第5题
He said that he ____________to the United States.
A、 had never been
B、 had never gone
C、 was never
D、 has never been
第6题
听力原文:W: Will John be coming to class this afternoon?
M: He's supposed to. But actually he cannot come out from the hospital until next week as the doctor has said.
Q: Where is John now?
(13)
A.At class.
B.Back at home.
C.At work.
D.In hospital.
第7题
听力原文:W: Will John be coming to class this afternoon?
M: He's supposed to. But actually he cannot come out from the hospital until next week as the doctor has said.
Q: Where is John now?
(13)
A.At class.
B.Back at home.
C.At work.
D.In hospital.
第8题
W: Sounds like fun. Fifty Years? Wow!
M: It sounds like fun to me, too.
W: What kind of farm does he have?
M: I've never been there, but he has chickens and cows and all. That means fresh eggs and fresh milk.
W: Does he have a family?
M: No, he doesn't. He never married. He's not as lucky as I am to have a family and grandchildren. I'm a lucky man.
W: How come he never got married?
M: That's a good question. He never married because the girl he was in love with in college married someone else, and he never got over it.
W: He must have loved her very much.
M: Yes, very much. Lillian. She was in our class.
W: And what happened?
M: She was in love with Donald, who captained the football team.
W: Football players are always popular with the ladies.
M: She liked Bob, but her heart was with Donald.
W: Where is she today?
M: I don't know. Maybe Lillian will be at the reunion.
W: You think so?
M: Bob's full of surprises.
W: I wish I could go there with you. What do you think the surprise will be?
M: With Bob, you never know, Robbin.
W: Won't it be exciting to see all your college friends there again?
M: It is already. I'm kind of excited about going now. Next weekend...sleep over Friday and Saturday night and come back Sunday. I can't wait!
(23)
A.Bob is the man's college friend.
B.Bob is a farm owner.
C.Bob can never get over his love for a girl.
D.Bob was once the captain of the football team.
第9题
W: Sounds like fun. Fifty Years? Wow!
M: It sounds like fun to me, too.
W: What kind of farm does he have?
M: I've never been there, but he has chickens and cows and all. That means fresh eggs and fresh milk.
W: Does he have a family?
M: No, he doesn't. He never married. He's not as lucky as I am to have a family and grandchildren. I'm a lucky man.
W: How come he never got married?
M: That's a good question. He never married because the girl he was in love with in college married someone else, and he never got over it.
W: He must have loved her very much.
M: Yes, very much. Lillian. She was in our class.
W: And what happened?
M: She was in love with Donald, who captained the football team.
W: Football players are always popular with the ladies.
M: She liked Bob, but her heart was with Donald.
W: Where is she today?
M: I don' t know. Maybe Lillian will be at the reunion.
W: You think so?
M: Bob's full of surprises.
W: I wish I could go there with you. What do you think the surprise will be?
M: With Bob, you never know, Robbin.
W: Won't it be exciting to see all your college friends there again?
M: It is already. I'm kind of excited about going now. Next weekend... deep over Friday and Saturday night and come back Sunday. I can't wait!
(23)
A.Bob is the man's college friend.
B.Bob is a farm owner.
C.Bob can never get over his love for a girl.
D.Bob was once the captain of the football team.
第10题
He is expected to make a speech this afternoon, ______.
A.is he not
B.isn't he
C.is not he
D.isn't it
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