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【判断题】
黄连来源于毛茛科，断面鲜黄色。来源于玄参科，断面棕色，质脆易折断。A.
正确
B.
错误
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【简答题】The Olympic flame: The Olympic flame is a symbol carried over from the ancient Olympics, where a sacred (神圣的) flame burned at the altar（神坛）of Zeus throughout competition. It was finally reintroduced a...
【单选题】Flame screens are used to ______.
A.
contain flammable fumes
B.
protect firefightiers from flames
C.
pr flames from entering tanks
D.
keep flame and sparks from getting out of an engine’s exhaust system
【单选题】A steady flame in a gas range is the result of ______.
A.
a burning velocity equal to the combustion wave
B.
fuel being supplied at the same rate as the combustion wave
C.
fuel being supplied at a higher rate than that of burning velocity
D.
a free flowing supply of air from the openings in the head of the burner
【单选题】If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.
A.
the crankcase explosion
B.
lifting of the cylinder safety valve
C.
a scavenge fire
D.
opening of the manhole
【单选题】As can be seen from the passage, Carry the Flame ______.
A.
was founded by Mr. Cavelier, a Vietnam veteran
B.
members come from all over the country
C.
riders are also members of Rolling Thunder
D.
hold the flame-lighting ceremony once a year
【单选题】When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?
A.
CO2
B.
Methyl chloride
C.
R-22
D.
Sulphur dioxide
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