对非保温罐，罐壁温度一般是将罐内所储油品温度和罐外气温进行平均计算。
参考答案：对
— Mr Black, this is Miss White.
— __________________________
— Nice to meet you, too. [ ]
A. How are you?
B. Nice to meet you.
由于镀铬层中含有（）会使铬层发脆。
A、氢
B、硅
C、碳
D、锰
