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【判断题】
冷冻机在备用和运行时油箱加热器电源不能断电。
A.
正确
B.
错误
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举一反三
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
they are approved by many experts
B.
C. they won’t cause diseases
C.
B. they taste better than standard foods
D.
they are free from pesticides
【单选题】当飞机主油箱出现不平衡现象时，应（）
A.
关闭油量较少的油箱内的燃油增压泵，再打开交输活门
B.
打开交输活门，再关闭油量较少的油箱内的燃油增压泵
C.
关闭油量较多的油箱内的燃油增压泵，再打开交输活门
D.
打开交输活门，再关闭油量较多的油箱内的燃油增压泵
【单选题】飞机燃油箱必须以某种方式与大气相通,其主要目的是
A.
降低燃油温度，防止燃油大量蒸发
B.
减小燃油箱内油面上的压力，防止燃油大量蒸发
C.
消除油箱内外气压差，保证顺利加油和向发动机供油
D.
增大空气在燃油中的溶解量，有利于燃油输送和燃烧
相关题目：
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
they are approved by many experts
B.
C. they won’t cause diseases
C.
B. they taste better than standard foods
D.
they are free from pesticides
【单选题】当飞机主油箱出现不平衡现象时，应（）
A.
关闭油量较少的油箱内的燃油增压泵，再打开交输活门
B.
打开交输活门，再关闭油量较少的油箱内的燃油增压泵
C.
关闭油量较多的油箱内的燃油增压泵，再打开交输活门
D.
打开交输活门，再关闭油量较多的油箱内的燃油增压泵
【单选题】飞机燃油箱必须以某种方式与大气相通,其主要目的是
A.
降低燃油温度，防止燃油大量蒸发
B.
减小燃油箱内油面上的压力，防止燃油大量蒸发
C.
消除油箱内外气压差，保证顺利加油和向发动机供油
D.
增大空气在燃油中的溶解量，有利于燃油输送和燃烧
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