完全预混式燃烧器还存在一些技术障碍,比如:稳定性比较差、需要采取必要措施防止脱火、冷回火与热回火等。
参考答案:对
三级汽车加油站的油罐总容积().
A、≤180
B、≤120
C、≤60
D、≤90
Between the two windows was taken 10 years ago.
A.a picture hangs that
B.a picture hanging which
C.does a picture hang which
D.hangs a picture that