推土机在上下斜坡时，可以（）。
A.直接向上行驶
B.横向行驶
C.对角线行驶
D.直接向下行驶
E.利用钢丝绳拖行
参考答案：A, D
________ the teachers is about 300 in our school and it is becoming_____________.
A．The number of, more and more
B．The number of, bigger and bigger
C．A number of, more and more
D．A number of, bigger and bigger
遗失通行证的（）承担由此引发的后果和责任
A、引领人员
B、陪同人员
C、单位和人员
D、职能部门
