【名词&注释】
建立健全(establishing and perfecting)、铁路客货运输(railway passenger and freight transport ...)、普通旅客列车(ordinary passenger train)、客货运输票据、不低于(no less than)、旅客列车车厢(passenger train compartment)
[单选题]冬季取暖期间普通旅客列车车厢(passenger train compartment)温度应不低于(no less than)()℃。
A. 16
B. 18
C. 20
D. 22