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【单选题】
TiO2气敏电阻可用于测量( )的浓度A.
CO
B.
N2
C.
气体打火机车间的有害气体
D.
锅炉烟道中剩余的氧气
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【单选题】Isn't it time you got down to ______ thepapers
A.
26. Isn't it time you got down to ______ thepapers? （重庆） A.mark
B.
bemarked
C.
beingmarked
D.
marking
【单选题】听力原文：W: Didn't you hear me come in? You really have an unusual power of focusing your attention. M: Are you talking to me? Q: What can be inferred from this conversation about the man? (15)
A.
He's amazed that the woman didn't hear him.
B.
He wasn't paying any attention to her.
C.
He prefers not to be talked to.
D.
He thinks the woman is making too much noise.
【简答题】紫外线最佳杀菌波长是( )
【单选题】下列说法错误的是( )。
A.
导线截面积主要根据工作电流 但对一些较小的电器，为保证有一定的机械强度，导
B.
面积不得小于0.5
C.
熔断器在电路中起保护作用
D.
在插接器的识别中，其符号涂黑的表示插座，白色的表示插头
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