加热炉不完全燃烧的原因有哪些?
参考答案:
①“三门一板”操作不好;
②雾化蒸汽量过小或雾化蒸汽压力过低;
③燃料油重,粘度大,雾化不好;
④燃料油压力过大。
Our school doesn't _____ students' staying in the classroom too long. We think they should have
time for sports. [ ]
A. advocate
B. admit
C. assess
D. approach
负载变化不规则的电流卡片,一般是井液相对密度发生变化或()过高所引起的。
A.井口流压
B.井底流压
C.地面回压
D.井底回压