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【多选题】
在短期内,刚开始随着产量的增加而增加的有( )。A.
总成本
B.
固定成本
C.
边际成本
D.
可变成本
E.
平均成本
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【单选题】The study of philosophies should make our own ideas flexible. We are all of us apt to take certain general ideas for granted, and call them common sense. We should learn that other people have held qu...
A.
The argument whether philosophy will ultimately be solved by science or not.
B.
The importance of learning philosophies, especially the history of philosophy.
C.
The difference between philosophy and science.
D.
A discussion about how to set a proper attitude towards future.
【单选题】What should we do to keep enough water in the body?
A.
To take two liters of water daily all through the year.
B.
To eat everything that contains water.
C.
To take in as much as we have lost.
D.
To drink only when we feel very thirsty.
【单选题】We are all told to take part in the dish—eating up Campaign . So everyone should _____ the dishes they ordered .
A.
serve
B.
empty
C.
catch
D.
control
【多选题】有关免疫球蛋白轻链的叙述，错误的是（ ）。
A.
免疫球蛋白有κ及λ两种轻链
B.
一种免疫球蛋白分子两条轻链可以共存κ、λ两个型
C.
人类血清中各类免疫球蛋白所含κ、λ两型的比例相近
D.
仅λ型游离链能从尿中排出
E.
轻链又称L链，分子量约25000
【单选题】The study of philosophies should make our own ideas flexible. We are all of us apt to take certain general ideas for granted, and call them common sense. We should learn that other people have held qu...
A.
The argument whether philosophy will ultimately be solved by science or not.
B.
The importance of learning philosophies, especially the history of philosophy.
C.
The difference between philosophy and science.
D.
A discuss about how to set a proper attitude towards future.
【简答题】血清中含量最多的免疫球蛋白类别是 ;机体最先产生的免疫球蛋白类别是 ;能通过胎盘的免疫球蛋白的类别 ;参与 I 型超敏反应的免疫球蛋白的类别是 ;与黏膜局部抵抗力有关的免疫球蛋白类别是 。
【单选题】埋弧自动焊对于厚度( )mm以下的板材，可以不开坡口(采用I形坡口)，只需采用双面焊接，背面不用清根，也能达到全焊透的要求。
A.
30
B.
24
C.
18
D.
12
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