单项选择题
一肥料包装袋上印有12-12-12,表明该肥料含有( )
A. 12%N,12%P2O5,12%K2O
B.12%N,12%P,12%K
C. 12 N:12 P2O5:12 K2O
D.12%N2O,12% P2O5 ,12% K2O
A.12%N,12%P,12%K
B.12%N2O,12%
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单项选择题
I didn't know what to do but then an idea suddenly () to me.A、A happenedB、B enteredC、C occurredD、D hit
A.
A、A
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单项选择题
某金属离子在弱八面体场中的磁矩为 4.9B.M.,而在强八面体场中的磁矩为零,该金属离子可能是.( )。(A)Cr 3+ ;(B)Mn 2+ ;(C)Mn 3+ ;(D)Fe 2+
A.9B.M.,而在强八面体场中的磁矩为零,该金属离子可能是.(
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