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【简答题】
简述混凝土在火灾中产生变形的主要原因。
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皮皮学刷刷变学霸
举一反三
【单选题】Which of these nutrients or hazardous substance has no DV?
A.
trans fat
B.
sugars
C.
protein
D.
all of the above
【单选题】which substance has the lowest wlwctric conductivity?
A.
Cu(s)
B.
Hg(l)
C.
H 2 (g)
D.
LiOH(aq)
【单选题】Which of the following words has the meaning of “any substance which plants or animals need in order to live and grow”?
A.
food
B.
nutrient
C.
comestible
D.
aliment
【单选题】某机械预算价格为10万元，耐用总台班为4 000台班，残值率5%，折旧年限10年，折现率为10%，则台班折旧费为（ ）万元。
A.
2.375
B.
10 000
C.
36.81
D.
1 000
【单选题】Which substance has been recognized as one of refresh matters and help work efficiently
A.
EGCG and EGC
B.
Caffeine
C.
Pigment and amino acid
D.
Vitamins and lipid
【单选题】Which of the following substance has the most hydrogen atom?
A.
1mol H 2
B.
0.5mol NH 3
C.
1molCH 4
D.
0.3mol H 3 PO 4
【简答题】进入壁垒和退出壁垒之间存在怎样的联系?
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