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【单选题】
某投资者觉得未来白糖价格可能会跌,则它应该对白糖期货合约进行A.
买入开仓
B.
卖出
C.
买入
D.
卖出开仓
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【简答题】How to operate oily water separator?
【单选题】Which of the following pumps is most suitable for an oily water separator?
A.
reciprocating pump
B.
vane pump
C.
mono pump
D.
axial-flow pump
【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
【单选题】The time of discharging oil is short, but oily water separator discharges oil frequentlyThe possible reason is ____.
A.
the sensor of low oil level is fully covered by sludge
B.
the coarse strainer before the pump in suction system is clogged
C.
the screw pump is worn seriously and volumetric efficiency is decreased
D.
bilge suction value is clogged
【单选题】Which of the following pumps will most affect oily water separator performance and give the worst result?
A.
reciprocating pump
B.
vane pump
C.
screw pump
D.
centrifugal pump
【简答题】对匀净度不高的鲜叶，在揉捻中可采取（）措施，以达到揉捻均匀的目的。
【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；
B.
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。
C.
等值电路中各绕组的电阻就是各绕组的实际电阻；
D.
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；
【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
B.
C.
等值电路中各绕组的电阻就是各绕组的实际电阻
D.
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
F.
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。
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