库仑测硫仪主要由管式高温炉、电解池和搅拌器、（）、送样程序控制器、空气供应及净化装置几部分组成。
参考答案：库仑积分器
Picasso's________ability was apparent in his early youth when he started drawing sketches.
A．writing
B．artistic
C．reasoning
D．literary
请简述浓缩塔真空度下降的原因？
