越野叉车、插腿式叉车堆垛车都是场（厂）专用机动车辆。
参考答案：对
______ for your help, We’d never have been able to get over the difficulties.
A．Had it not
B．Had it not been
C．If it were not
D．If we had not been
下列反应中，能区分醌和其他类型化合物的是（）
A.Legal反应
B.Feigl反应
C.Molish反应
D.Lieberman-Burchard反应
E.Keller-Killiani反应
