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【判断题】
调整pH=5左右后加入NH4F,可以掩蔽 Al 3+ 形成 AlF 6 3-A.
正确
B.
错误
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举一反三
【判断题】One volt is defined as that magnitude of electromotive force required cause a current of one ampere to pass through a conductor having a resistance of one ohm.
A.
正确
B.
错误
【简答题】One ohm is defined as that amount of that will limit the current in a conductor is one ampere when the voltage applied to the conductor is one volt.( 一个横线填写一个单词 )
【单选题】{One ohm is defined as the amount of resistance in a circuit so that when one volt is applied to the circuit, one ampere of current will flow.}
A.
ampere
B.
true
C.
false
D.
omega
【简答题】One Ohm is defined as that amount of resistance that will limit the current in a conductor to one ampere when the voltage applied to the conductor is one volt.
【简答题】当加工中心机床主轴转速高达6000r/min以上时,高速旋转的刀具存在____所产生的离心力将对主轴等施加周期性载荷,从而引起振动。
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