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【单选题】
下列关于、燃点和自燃点说法错误的是( )。
A.
、燃点和自燃点是有关燃油着火燃烧的特性指标,是衡量燃油贮运安全密切相关的指标
B.
燃油加热到某一温度时,表面蒸发的油气增多,当油气和空气的混合物与明火接触时,发生短暂的闪光(一闪即灭),此时的温度即为
C.
在燃油温度超过继续加热时,当燃油蒸气和空气混合物遇到明火能着火并继续燃烧(时间不少于5s)时的最低温度称为燃点,油的燃点一般要比低20~30℃:
D.
自燃点是指油品缓慢氧化而开始自行着火燃烧的温度,油品的自燃点和它们的燃点没有直接关系,而只取决于油品的化学组成,并随压力而变化
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参考答案:
举一反三
【单选题】Somebody has to keep a vigilant eye on a reality that huge, especially when it is a reality that decides this University's present and future.
A.
vigorous
B.
secret
C.
sharp
D.
busy
【单选题】三棱台 ABC-A 1 B 1 C 1 中, AB ∶ A1B1 =1∶2,则三棱锥 A 1 ABC , B - A 1 B 1 C, C-A 1 B 1 C 1 的体积之比为(  )
A.
1∶1∶1
B.
1∶1∶2
C.
1∶2∶4
D.
1∶4∶4
【单选题】_______we are concerned , this China Culture Tour is very exercising and a huge success.
A.
As soon as
B.
As far as
C.
As though
D.
Now that
【单选题】-I have got into the __________ of turning on the TV as soon as I get home. -I think it's not good and you should do your homework first. [     ]
A.
hobby
B.
habit
C.
interest
D.
walk
【简答题】n. 商店,贮藏; vt. 储存,贮藏
【单选题】I ______ you as soon as I get there.
A.
visit
B.
will visit
C.
visited
【简答题】什么叫安时特性
【单选题】This is a huge and difficult project and if you take it up, you ________ many difficulties.
A.
like to encounter
B.
like to encountering
C.
are likely to encounter
D.
are like to encounter
【单选题】因为特定情境引起的暂时的不安状态叫()
A.
暂时焦虑
B.
特质焦虑
C.
状态焦虑
D.
人格焦虑
【单选题】如图,在三棱台ABC-A 1 B 1 C 1 中,AB:A 1 B 1 = 1:2,则三棱锥A 1 -ABC,B-A 1 B 1 C 1 ,C-A 1 B 1 C 1 的体积之比为 [     ]
A.
1:1:1
B.
1:1:2
C.
1:2:4
D.
1:4:4
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