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【单选题】
因主要用于A.
表面麻醉
B.
传导麻醉镇
C.
浸润麻醉
D.
传导麻醉
E.
蛛网膜下隙麻醉
F.
硬膜外麻醉
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【单选题】A flame screen（）.
A.
permits the passage of vapor but not of flame
B.
prevents the passage of flammable vapors
C.
prevents inert gas from leaving a tank
D.
permits vapors to exit but not enter a tank
【单选题】Flame screens are used to ______.
A.
contain flammable fumes
B.
protect firefightiers from flames
C.
prevent flames from entering tanks
D.
keep flame and sparks from getting out of an engine’s exhaust system
【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
【单选题】对切断肺结核传播途径最有效的措施是
A.
积极开展广泛性的环境消毒
B.
异烟肼预防性服药
C.
对于易感人群加强保护
D.
隔离并治疗痰菌涂阳患者
E.
全民接种卡介苗
【单选题】Flame failure in an automatically fired auxiliary boiler can from a/an _________.
A.
incorrect electrode setting
B.
incorrect nozzle position
C.
clogged fuel nozzle
D.
broken high tension lead
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