气相色谱检测系统的功能是把柱子分离流出的组分，按其浓度或质量的变化准确地转化为一定的（）。
参考答案：电信号
Does it ever _______ to you that they would be punished for being late?
A．strike
B．occur
C．happen
D．appear
运货上货柜车前检查内容包括？
