焦炭火落时表现的现象为()
A. 荒煤气颜色为蓝白色
B. 荒煤气颜色为黄色
C. 荒煤气颜色为白色
D. 荒煤气颜色为无色
Thelubeoilinthebearingsisdrawnfroma(),usuallylocatedinthebedplate.
A. tank
B. sump
C. vessel
D. bottle
Thelubricatingpipesanddustsshouldbeblownoutwith().
A. atmosphere
B. thefreshwater
C. compressedair
D. chemicalcompounds
Thestepofapilotladderwhichpreventstheladderfromtwistingisthe().
A. Proofbar
B. Shiftingbar
C. Longbar
D. Spreader