布风板上的孔一般按（）。
A、四方形布置；
B、菱形布置；
C、等边三角形；
参考答案：C
检修和操作岗位时常用的“三牌”是指检修牌、操作牌、停送电牌。
What does Paul look like? [ ]
A. He's tall and has brown hair.
B. He's clever.
C. He's my brother.
D. He's a worker.
