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（请给出正确答案）
A.1 meter from the deck and in the bottom of the tank
B.In the middle of the tank
C.1 meter from the deck and in the middle region of the ullage space
D.2 meter from the deck and in the middle region of the ullage space
答案
C、1 meter from the deck and in the middle region of the ullage space
更多“Where in the tank shall the oxygen level be determined before crude oil washing（）”相关的问题
第1题
The water is brought from the waterworks to each street by a large underground pipe—a water main. The water in this pipe is then forced by pressure into the smaller pipes which carry it to storage tanks at the tops of the buildings. Other pipes bring the water down from the storage tank to the kitchens and bathrooms in the building.
When the water has been used, it is taken away from the building by drainpipe. These take the waste water to another large pipe under the road—the main sewer. The waste water then flows along the sewer to the sewage works where it is cleaned. This "clean" water is then poured into the sea or into a river, or in some countries, sent back to the waterworks to be used again.
Electricity is also brought to the house by a main, in this case a cable. This cable may be underground or, in country districts, it may hang above ground on pylons. The cable is connected to a meter in the building. This meter measures the amount of electricity that is used in the building. Near the meter there is a master switch which can cut off the supply of electricity. There are also fuse boxes between the master switch and the wires which take the electricity to each of the switches in the building. All these wires, fuses and switches are the "wiring circuit".
It can be inferred from this passage that______.
A．water and electricity are the only main services in our homes
B．the pipes bringing water to our homes are unimportant
C．water is less significant than electricity in our homes
D．we are unaware of how water or electricity is brought to our homes
第7题
A good plan when fighting against an enemy tank is to______.
A．shoot its back
B．get near to it from behind
C．move it to the side
D．move out of its way
第10题
A good plan when fighting against an enemy tank is to ______.
A．shoot its back
B．get behind it
C．move it to the side
D．move out of its way
