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火柴是日常生活中一种取火的用品。火柴盒外侧红磷和摩擦剂,火柴头上的火药是由氯酸钾、二氧化锰以及可燃物三氧化二锑(Sb 2 O 3 )组成。火柴取火时,用火柴头蹭一下火柴盒的外侧,火柴盒上产生的火星引燃火柴头上的三氧化二锑,从而使火柴梗燃烧起来。 (1)从可燃物燃烧的条件分析,用火柴头蹭一下火柴盒外侧的目的是 ; (2)火柴燃烧产生一种有刺激性气味的气体,这种气体是 ; (3)当火星引燃三氧化二锑后,过一会可以发现火柴梗燃烧得更旺,其原因是 。
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【单选题】变电所防护直击雷的措施是()。
A.
A装设架空地线;
B.
B每线装阀型避雷器;
C.
C装设独立避雷针;
D.
D装放电间隙;
【判断题】已知逻辑函数 A+B=AB ,则 A=B
A.
正确
B.
错误
【单选题】How did the leader of governments opponents get away from the police?
A.
With the help of guns.
B.
With the help of their leaders.
C.
With the help of bombs.
D.
With the help of proponents.
【简答题】—How did you find the leader of the Youth League? —Well, she talks __________ she herself were an expert on the agers. Aas if                       B. even though                  C. even if      ...
【单选题】变电所防护直击雷的措施是()。
A.
装设架空地线;
B.
每线装阀型避雷器;
C.
装设独立避雷针。
【单选题】变电所防护直击雷的措施是 _______。
A.
装设架空地线
B.
每线装阀型避雷器
C.
装设独立避雷针
D.
多设置接地极
【单选题】Mike is a first-rate leader who knows how to call the ______.
A.
snaps
B.
shootings
C.
shots
D.
strokes
【判断题】已知逻辑函数A+B=AB,则A=B
A.
正确
B.
错误
【单选题】变电所防护直击雷的措施是 ( ) 。
A.
装设架空地线
B.
每线装阀型避雷器
C.
装设避雷线
D.
装设独立避雷针。
【单选题】----How do you find our company? ----A little worried. We _________ ground as a leader in the field of IT with the others speeding up development.
A.
have lost
B.
are losing
C.
lost
D.
were losing
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