变压器的保护装置必须(),瓦斯继电器应安装调整(),定期检查,消除误动因素。
参考答案:完善可靠;正确
下列粒子的结构示意图中属于阳离子的是 ( )
Not ever to “Shanzhamei”, a country girl, that she could be the first runner-up of 2013 on the Avenue of stars, CCTV .
A.it occurred
B.it occurs
C.has it occurred
D.did it occur