接触网带电部分与装载货物的距离不得小于()。
A.300mm
B.350mm
C.400mm
D.200mm
参考答案:B
As we know, many of Zhang Yimou’s movies are_______ the countryside where there is a beautiful scenery.
A.made of
B.located in
C.begun with
D.set in
化工设备图的管口表中各管口的序号用()。
A、大写数字
B、小写数字
C、大写英文字母
D、小写英文字母