在装运氧气等强氧化性气体时，应对车厢进行清理，绝对不能在车厢内存留____。
A.木板、橡胶
B.钢索、铁架
C.油脂或含有油脂的残留物
参考答案：C
________ by his look, he doesn't think much of our plan.
A．Judging
B．Judged
C．To judge
D．Being Judged
长方体的底面积一定，体积和高成______比例．
