乙二醇冷却器出口空气温度为()℃。
A.5
B.10
C.0
D.20
参考答案:A
If ____unsolved, the problem of food safety may lead to more serious results.
A.left
B.making
C.remained
D.taking
列车中乘坐旅客的车辆与机车,货车相连接的客车端门须()
A.关闭
B.打开
C.加锁