A. 10~14mm B. 15~25mm C. 8~12mm D. 25~30mm E. 11~13mm
A. Questions from 36 to 40 are based on the following passage:
A. 形状 B. 缺陷 C. 冶炼方式 D. 化学成份
A. 按响故障报警器 B. 按响道口接近报警器 C. 按响道口广播 D. 按亮道口信号