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单选题
A chemical additive to LPG gives it a characteristic（）.
A
odor
B
color
C
pressure
D
density
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单选题（）as the chemical extinguisher agent, should be used for a an electric fire.A
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单选题According to the Chemical Data Guide，1，3 - pentadiene possesses which characteristic? （）A
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考题
单选题An additive used to improve the ability of a lube oil to reduce friction is known as a/an （）.A
suppressant additiveB
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viscosity improver additive
考题
名词解释题单体附加系（Monosomic additive line）
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