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【单选题】
除去下列物质中的杂质所选用试剂或操作方法不正确的一组是 （ ） 物质 所含杂质 除去杂质的试剂或方法A.
CaO CaCO 3 HCl
B.
CuO Cu. 灼烧
C.
NaOH溶液 Na 2 CO 3 适量Ca(OH) 2 溶液、过滤
D.
O 2 H 2 O 干燥
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举一反三
【单选题】What are the three classes of factors that influence perception?
A.
factors in the setting, factors in the environment and factors in the motives
B.
factors in the perceiver, factors in the target and factors in the situation
C.
factors in the character, factors in knowledge and factors in experience
D.
factors in the personality, factors in the character and factors in the values
【简答题】two factors system
【单选题】61%of ulcer risk seems to be caused by
A.
unknown factors．
B.
economic factors．
C.
environmental factors．
D.
genetic factors．
【简答题】People speak of 'push' and 'pull' factors concerning migration. Push factors are associated with the place of origin. It could be difficulty in finding a suitable job, war, or famine. Pull factors are...
【单选题】What is the relationship between present value factors and future value factors?
A.
The present value and future value factors are equal to each other .
B.
The present value factor is the exponent of the future value factor.
C.
The future value factor is the exponent of the present value factor.
D.
The factors are reciprocals of each other.
【单选题】下列难溶盐的饱和溶液中, [Cu + ] 浓度最大的是( )。
A.
CuCl (Ksp = 1.72 × 10 -7 )
B.
CuBr (Ksp = 6.27 × 10 -9 )
C.
CuI (Ksp = 1.27 × 10 -12 )
D.
CuSCN (Ksp = 1.77 × 10 -13 )
【简答题】Factors of production
【多选题】Some factors that affect child growth and development, these factors include:( )
A.
Heredity
B.
Nutyrition
C.
prenatal environment
D.
Illness and psychosocial factors
E.
hormones
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