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【判断题】
The key to understanding the multiattribute model to evaluate alternatives is being aware that consumers examine sets of product attributes across an array of brands.A.
正确
B.
错误
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【简答题】oily water separator
【单选题】The pressure difference of the gauge on the oily water separator increases greatly, the reason is____.
A.
the filter is clogged
B.
bilge suction value is clogged
C.
suction value and discharge value of the pump do not open fully
D.
screw pump is worn seriously and volumetric efficiency is decreased
【简答题】(1)函数 的定义域为___________ (2)函数 的定义域为______ (3)函数 的定义域为_________ (4)函数 的定义域为________
【单选题】How is the oily water separator?
A.
It is in good order
B.
There is something wrong with it
C.
It is working well
D.
It is in normal condition
【简答题】已知函数f(x)=x 2 -4x-4。 （1）若函数定义域为[3，4]，求函数值域； （2）若函数定义域为[-3，4]，求函数值域； （3）当x∈[a-1，a]时，y的取值范围是[1，8]，求a。
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