塑胶材料喷灰色油时,可以啤成白色吗?为什么?
参考答案:不行,一般喷什么颜色,啤件底色要与之相近,否则易透光,会变色
---______ he managed to solve the problem?
---Oh,he turned to Professor Lee for advice.[ ]
A.Was it how that
B.Was it that how
C.How was it that
D.How it was that
无运转车长值乘的列车,中间站保留及甩挂作业的货物列车,车站如何检查?