烟气炉煤气调节阀是φ200的()。
A.手动蝶阀
B.截止阀
C.楔式闸板
参考答案:C
说明“运行”、“热备用”、“冷备用”、“检修”四术语的区别?
()has the ship?
A.How much hatches
B.How many hatch
C.How much hatch
D.How many hatches