As for a oil-fired boiler too much air would indicated by _____.A.yellowish flameB.golden
As for a oil-fired boiler too much air would indicated by _____.
A.yellowish flame
B.golden yellow flame
C.milky flame
D.brilliant white flame
As for a oil-fired boiler too much air would indicated by _____.
A.yellowish flame
B.golden yellow flame
C.milky flame
D.brilliant white flame
A.take no measures
B.extinguish the fire as soon as possible
C.feed water to the boiler
D.open the blow down valve
Too much air in the furnace of an oil-fired boiler would be indicated by _____.
A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame
A.(1)
B.(1) and (2)
C.(2)
D.neither (1) nor (2)
A、A
B、P(A)
C、{ <φ,a> , <φ,b> ,<{a},a>,<{a},b>,<{b},a>,<{b},b>, <a,a> , <a,b> }
D、{ <a,φ> , <b,φ> , <a,{a}> , <b,{a}> , <a,{b}> , <b,{b}> , <a,a> , <b,a> }
设集合A={a,b,c},B={a,b},那么ρ(A)-ρ(B)=______,ρ(B)-ρ(A)=______
A.{ a=b; b=a; }
B.{ b = a * b; a = b / a; b = b / a; }
C.{ t=a; a=b; b=t; }
D.{ a = a + b; b = a – b; a = a – b; }
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