This paper gives several determined value rules to type of indeterminate forms of functions of two variables. These contain the first order and the second order decision rules of the limit.

给出二元函数型来定式的各种值法则，包括一阶极限判定法则和二阶极限判定法则。

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First, the distance between the anode and cathode should be increased enough in order to limit the secondary reaction.

提高电流效率的途径有两条：一是增大阴、阳极间距，减小副反应的发生；

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First, the distance between the anode and cathode should be increased enough in order to limit the secondary reaction.

提高电流效率的途径有两条：一是增大阴、阳极间距，减小副反应的发生；

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