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【单选题】
汽油机电子燃油喷射系统中油压调节器的功用是:使燃油供给系统的压力与进气管压力( )保持恒定。A.
之差
B.
之和
C.
之积
D.
之商 注解: 燃油压力调节器的工作原理:当燃油总管的燃油进入燃油室,供油压超过预定值时,即进气歧管真空度增加。此时燃油压力将膜片向上顶,克服弹簧力,使阀门打开,燃油室内过剩的燃油经回油管流回油箱中,油压减小;当油压低于弹簧力与进气歧管压力之和时,阀门关闭,油压升高。
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【简答题】(图书或商品等的)目录;为...编目录,把...编入目录
【判断题】An individual who has an extensive knowledge of a product category will likely spend more time in the external search process than someone with just a moderate level of product category knowledge.
A.
正确
B.
错误
【简答题】多年父子成兄弟的涵义究竟是什么?
【单选题】New-product development time is the time taken by companies to ________.
A.
test the prototype and start the large scale production of a product
B.
design and develop the prototype product
C.
create new products and bring them to market
D.
improvise existing products and re-launch them to market
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