One Question per Day on Refining Knowledge (Technology) 110406

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We welcome everyone to actively participate in the learning and discussion of professional basic knowledge in the refining technology exchange area! In accordance with the forum’s uniform requirements, the maximum score for this activity is 5 Wealth points, and rating charm is prohibited. Friendship requests and duplicate ratings are also declined. Be cautious when posting; editing is ineffective. Those who have different opinions on the provided answer keys can post discussions the next day; those who provide solutions or their own opinions regarding the daily question’s answer key will receive appropriate rewards! The focus is on participation, and there are prizes for it. Please hide your replies; those that are not hidden will be deleted. Instructions for hiding replies: Click on \"Hide\" in the title menu (the option will become visible when the mouse is placed over it), and then place the content you want to hide between \"hide\" and \/\hide\/. True or False question 1. A gear pump is a type of positive-displacement pump. （ ） 2. The water ring vacuum pump is a type of velocity pump. ( ) 3. Among impellers with the three types of blade curvature, those with backward-curving blades achieve the highest head. ( ) 4. In industrial applications, the impellers of centrifugal pumps almost always use forward-curved blades. ( ) 5. Compared to impellers with an infinite number of blades, impellers with a finite number of blades exhibit a lower head, and the main reason for this is the effects of various losses in the pump. ( ) Reference answer √√√√√