单项选择题
I didn't know what to do but then an idea suddenly () to me.
A、A happened
B、B entered
C、C occurred
D、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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单项选择题
帧是什么单位()
A.强度
B.时间
C.长度
D.速度
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