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【单选题】
三相变压器并联运行时,要求并联运行的三相变压器的联结组别____。
A.
必须相同，否则不能并联运行
B.
不可相同，否则不能并联运行
C.
组别标号的差值不超过1即可
D.
只要组别号相等，Y，y联结和Y，d联结的变压器也可并联运行
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【单选题】在pH=4~5条件下,测定铜盐中铜的含量所选择的指示剂使是( ).
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