【单选题】Which of the following pumps is most suitable for an oily water separator?
【简答题】oily water separator
【单选题】下列各种风险管理策略中,采用哪一种来降低非系统性风险最为直接、有效( )。
【单选题】The pressure difference of the gauge on the oily water separator increases greatly, the reason is____.
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
【单选题】下列各种风险管理策略中,采用哪一种来降低非系统性风险最为直接、有效( A )。
【单选题】How is the oily water separator?
B.
There is something wrong with it
D.
It is in normal condition
【单选题】对于自耦变压器,等值电路中各绕组的电阻,下述说法中正确的是( )。
A.
等值电路中各绕组的电阻,是各绕组实际电阻按照变压器变比归算到同一电压等级的电阻值
E.
等值电路中各绕组的电阻是各绕组的等效电阻归算到同一电压等级的电阻值
G.
等值电路中各绕组的电阻一定为正值,因为绕组总有电阻存在。
【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。