下载APP
【单选题】
炼油厂生产的绝缘油一般都加有T501抗氧化剂，其含量为（）。
A.
0.3%-0.5%
B.
0.5%-0.7%
C.
1%-1.2%
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】If those "mad moments"— when you can’t recall what your friend has told you or where you left your keys—are becoming more frequent, mental exercises and a healthy brain diet may help. Just as bodies r...
A.
everyone can be forgetful sometimes regardless of one’s age
B.
we can prevent our sound mind from aging with certain methods
C.
brain aging starts from the time when we are in our 20s and 30s
D.
memory loss is a sign that shows we are getting old
【多选题】以下关于绝缘油击穿电压检测，说法正确的是（）。
A.
电极间距离应为2.5mm正负0.05mm，要用标准规校准
B.
油中有水分及其他杂质时对击穿电压有明显影响，试样一定要摇荡均匀后注入油杯
C.
油杯不用时应清空，加盖，保存在干燥的地方，防止受潮
D.
将试样杯放入测量仪上，如使用搅拌，应打开搅拌器。测量并记录试样温度