综合保护与集中控制装置可实现低速、超速、断带、纵向撕裂、堆煤、跑偏、急停、烟雾、温度等保护,并可执行()降温。
参考答案:洒水
— ______?
— He's friendly and helpful.[ ]
A. What's he like?
B. How's he?
C. What's he?
D. What does he like?
铣削一单线螺旋槽工件,计算时,其导程()螺旋线的螺距。
A.大于
B.等于
C.小于