皮皮学，免费搜题
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【简答题】
关系代数包含哪两大类运算?每一类中包含哪些具体的运算?
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】犬，9月龄，食欲减退，久泻不止，肛门松弛，消瘦，被毛凌乱，口色淡白，舌苔薄白，脉虚无力。该证候对应症型( )A.大肠湿热 B.大肠冷泻 C.胄食滞 D.脾气下陷 E.食积大肠 犬，3月龄，食欲减退，不时呻吟，腹泻，粪便黏腻腥臭，带有脓血，口色红，舌苔黄腻，脉滑数，该证候的证型是( )A.大肠湿热 B.大肠冷泻 C.胄食滞 D.脾气下陷 E.食积大肠
【单选题】How the electric power is generated?
A.
kinetic-potential generation
B.
chemical-mechanical generation
C.
thermal-mehanical generation
D.
internal-mechanical generation
【简答题】What is the major difference between the turbojet and the turboprop in how they handle the generated power?
【简答题】The flywheel connected to the crankshaft provides the momentum to keep the crankshaft turning without the application of power, through the energy generated during the power stroke.
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