Radiation heat transfer of smoke tube boiler mainly occurs in , convection heat transfer mainly occurs in .
A: Furnace and smoke pipe
B: Smoke pipe and furnace
C: Needle tube, smoke box
D: Smoke box and smoke pipe
A: Furnace and smoke pipe
B: Smoke pipe and furnace
C: Needle tube, smoke box
D: Smoke box and smoke pipe
举一反三
- People are not allowed ____ in the cinema, but they will allow ____in the rest room. A: to smoke, smoke B: smoking, to smoke C: to smoke, smoking D: smoking, smoke
- They have made _______ a rule _________ in the room. A: this; not to smoke B: it; smoking C: it; to not smoke D: it; not to smoke
- 将烟雾探测器1连接到烟雾探测器2上 A: Attach smoke detector 1 to smoke detector 2. B: Glue smoke detector 1 to smoke detector 2. C: Join smoke detector 1 to smoke detector 2. D: Link smoke detector 1 to smoke detector 2.
- ______ is forbidden in the meeting-room but we are allowed ______ in the room for smokers. A: Smoking, smoking B: Smoking, to smoke C: To smoke, smoking D: To smoke, to smoke
- I"d rather you ______ in bed. A: don"t smoke B: doesn"t smoke C: didn"t smoke D: not smoke