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[主观题]
写出Al,Cr,Cu,Ag,Nb,Mo,Ru,Rh,Pd,Pt,Au,Ce,Gd,Pb的核外电子构型,它们各属于哪一周期、哪一族?其中哪些原子构型遵循了Hund规则?
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A.Hamlet
B.King Lear
C.Othello
D.Macbeth
A.符号检验
B.游程检验
C.威尔科克森带符号的等级检验
D.曼—惠特尼U检验
E.等级相关检验
The new findings about global climate change are based on______.
A.new data
B.the virtual models
C.lab experiments
D.scientists' observation
以下叙述正确的是()。
A.用HCl滴定NaOH,选PP为指示剂的终点误差为正值
B.NaOH滴定HCl,选MO为指示剂的终点误差是正值
C.用蒸馏法测NH4+,若采用HCl吸收NH3,以NaOH返滴定至pH为7.0,终点误差为正值
D.蒸馏法测NH4+,若采用H3BO3吸收NH3,以HCl滴定至MO变色,终点误差为负值
When will producers have a surplus of goods?
A.When supply equals demand.
B.When there is more supply than demand.
C.When there is more demand than supply.
D.When they sell all of their goods.