MIP.watch('count', function (newVal, oldVal) { fetch('http://www.chazidian.com/kaoshi/ajaxapi/?action=guanzhu&id=115520&type=2') .then(function (res) { var follows2 = MIP.getData('follows') if(follows2==1){ MIP.setData({ follows:2, title:'收藏' }) } if(follows2==2){ console.log(2) MIP.setData({ follows:1, title:'已收藏' }) } }) .catch(function (err) { console.log('数据请求失败!') }) })

电压互感器是()

A、电压源,内阻视为零
B、电流源,内阻视为无穷大
C、电流源,内阻视为零
D、电压源,内阻视为无穷大
查看答案
正确答案:

A

答案解析:

暂无解析

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