对工业锅炉,应保持渣斗处水封水位和除尘器灰斗排灰口(),可减少炉膛漏风。
A.密封
B.打开
C.半开
D.留点缝
参考答案:A
—You are always full of _______.Can you tell me the secret?
—Taking plenty of exercise every day.
A.power
B.strength
C.force
D.energy
脂肪栓塞综合征,一般于骨折后的()天开始发病。