多项选择题

脱氧吡啶酚更具高骨吸收特异性和灵敏度，其原因是：（）

A．它是由胶原自然形成的，非生物合成
B．从尿中排出前不被代谢
C．骨是脱氧吡啶酚的主要来源
D．不受饮食的影响

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单项选择题

听力原文：M:Excuse me. Have you been waiting long?
W:About ten minutes.
M:Did you notice whether the No. 7 bus has passed by?
W:Not while I've been standing here. I'm also waiting for the No. 7 bus myself.
M:Good. Hot today, isn’t it?
W:Yes,it is. I wish that it would rain and cool off.
M:Me too. This is unusual for March. I don't remember it ever being so hot and dry in March before.
W:You were born in Florida then.
M:No. I was born in New York, but I've lived here for ten years now.
W:My mother and I have just moved here from Indiana.
M: Pretty cold in Indiana, isn’t it?
W: Yes. That's why we moved, but we didn't know that it would be so hot here. We should have gone to California. Do you think we've missed the bus? I've been here for twenty minutes already.
M: Take it easy. It never comes exactly on the half-hour like it should.
Why is the woman waiting?
A．She is waiting for the man.
B．She is waiting for her mother.
C．She is waiting for a bus.

A.
M:Did
B.
M:Good.
C.
M:Me
D.
W:You
E.
M:No.
F.
W:My
G.
M:
H.
M:
I.
Why
J.She
K.
B．She
L.
C．She
M.

【简答题】某加热炉的有效长度为31.05m，加热钢坯的尺寸为厚160mm或220mm，宽1350mm，长2500mm，求该加热炉的推钢比。

答案：

该炉的推钢比=加热炉有效长度/加热钢坯的最小厚度=31.05/0.16=194.06
答：该加热炉的推钢比为194.06。