从事道路危险货物运输的车辆，其车况证明由各（）的机务科室出具。
A、运输企业
B、区县运政管理机构
C、车辆检测站
参考答案：B
We desire that immediate help________to the local villagers who have been trapped by the flood. [ ]
A. be given
B. will be given
C. should give
D. is given
氮总平衡
