Except for the parameters to be set when applying pcv.

【 multiple-choice 】 ventilation parameters to be set when using PC, except ().

A. inspiratory pressure

B. Respiratory frequency

C. pressure gradient

D. In wet places

E. inspiratory expiratory ratio

Correct answer: BDE

1 and PCV refer to polypoid choroidal angiopathy.

PCV is a polypoid choroidal vascular disease, which is a common ocular fundus disease in Asia. It is characterized by orange-red nodular lesions under the retina, abnormal branched choroidal vascular network and polypoid choroidal vasodilation lesions at its distal end. Because the clinical manifestations of PCV are similar to wet age-related macular degeneration, it is often diagnosed as wet AMD, but there are great differences between them in indocyanine green angiography, course prognosis and treatment.

2.PCV is the abbreviation of forced ventilation of crankcase in English, which means active ventilation control system of crankcase (or oil pan) in Chinese. PCV valve consists of valve body, valve, bonnet and spring, which are inseparable. Its main function is to guide the gas in the crankcase into the intake manifold through the PCV valve, and a small amount of air directly enters the intake manifold from the air cleaner through the PCV valve, thus avoiding the phenomena of freezing at the throttle, insufficient combustion, and deterioration of emissions. Prevent blowby gas from entering the atmosphere, and at the same time prevent engine oil from deteriorating.