本课配套习题挑战模式1/5
单选题
难度系数:
1.一台汽油机的功率为33kW,工作8h共消耗汽油80 kg,则此汽油机的效率为(q汽油=4.6×107 J/kg)()
A: 26% |
B: 89% |
C: 2.6% |
D: 8.9% |
一次做对,真牛!
+5奖励规则>
- 提示1:PHN0cm9uZz7ng63mnLrnmoTmlYjnjofvvJo8L3N0cm9uZz7Otz1XPHN1Yj7mnInnlKg8L3N1Yj4vUTxzdWI+5oC7PC9zdWI+w5cxMDAl77yM5YW25LitVzxzdWI+5pyJ55SoPC9zdWI+5oyH55So5p2l5YGa5pyJ55So5Yqf55qE6IO96YeP77yMUTxzdWI+5oC7PC9zdWI+5oyH5a6M5YWo54eD54On6YeK5pS+55qE6IO96YeP
- 答案:QQ==
5qC55o2u5YWs5byPzrc9VzxzdWI+5pyJ55SoPC9zdWI+L1E8c3ViPuaAuzwvc3ViPsOXMTAwJe+8jFc8c3ViPuacieeUqDwvc3ViPj1QdO+8jFE8c3ViPuaAuzwvc3ViPj1tcTxzdWI+5rG95rK5PC9zdWI+77yM5bCG5pWw5o2u5Luj5YWl5LiK6L+w5LiJ5Liq5YWs5byP77yM5Y+v5b6Xzrc9IDI2Je+8jOaJgOS7peetlOahiOS4ukEu
本课配套习题挑战模式2/5
单选题
难度系数:
2.关于热机的效率,下列说法中正确的是( )
A: 热机做的有用功越多,效率就一定高 |
B: 热机的功率大,效率就一定高 |
C: 热机消耗的燃料越多,效率就一定高 |
D: 以上说法都不正确 |
一次做对,真牛!
+5奖励规则>
- 提示1:PHN0cm9uZz7ng63mnLrnmoTmlYjnjofvvJo8L3N0cm9uZz7Otz1XPHN1Yj7mnInnlKg8L3N1Yj4vUTxzdWI+5oC7PC9zdWI+w5cxMDAl77yM5YW25LitVzxzdWI+5pyJ55SoPC9zdWI+5oyH55So5p2l5YGa5pyJ55So5Yqf55qE6IO96YeP77yMUTxzdWI+5oC7PC9zdWI+5oyH5a6M5YWo54eD54On6YeK5pS+55qE6IO96YeP
- 答案:RA==
54Ot5py655qE5pWI546H5piv5oyH55So5p2l5YGa5pyJ55So5Yqf55qE6IO96YeP5LiO54eD5paZ5a6M5YWo54eD54On5Lqn55Sf55qE6IO96YeP5LmL5q+U77yO5omA5LulQUPor7Tms5XplJnor6/vvI7lip/njofmmK/niankvZPlgZrlip/lv6vmhaLnmoTniannkIbph4/vvIzkuI7ng63mnLrnmoTmlYjnjofnmoTpq5jkvY7ml6DlhbPvvI7miYDku6VC6K+05rOV6ZSZ6K+v77yO5omA5Lul562U5qGI5Li6RO+8jg==
本课配套习题挑战模式3/5
单选题
难度系数:
3.热机的效率较低,为了提高热机的效率,你认为下列方法目前不可能的是( )
A: 尽量使燃料充分燃烧 |
B: 尽量减少各种热损失 |
C: 尽量减少因克服摩擦力而额外消耗的能量 |
D: 想办法把燃料放出的热量全部用来做有用功 |
一次做对,真牛!
+5奖励规则>
- 提示1:54Ot5py65Zyo5bel5L2c5pe277yM5LiA5a6a5Lya55Sx5LqO5py65qKw5pGp5pOm5ZKM5pWj54Ot5o2f6ICX5LiA6YOo5YiG54eD5paZ5pS+5Ye655qE54Ot6YeP
- 答案:RA==
5Zyo546w5pyJ5p2h5Lu25LiL77yM54Ot5py65bel5L2c6L+H56iL5Lit54eD5paZ5LiN5Y+v6IO95a6M5YWo54eD54On77yM5py65qKw5pGp5pOm5ZKM5pWj54Ot6KaB5raI6ICX6IO96YeP44CB5bqf5rCU5bim6LWw6L6D5aSn6YOo5YiG6IO96YeP77yO5omA5Lul54eD5paZ54eD54On6YeK5pS+5Ye655qE54Ot6YeP5LiN5Y+v6IO95YWo6YOo5YGa5pyJ55So5Yqf77yO5omA5Lul562U5qGI5Li6RC4=
本课配套习题挑战模式4/5
单选题
难度系数:
4.热机效率高是指( )
A: 热机的温度高 |
B: 热机的功率大 |
C: 热机在单位时间内消耗的燃料少 |
D: 转化的机械能占燃料完全燃烧时放出热量的百分比大 |
一次做对,真牛!
+5奖励规则>
- 提示1:54Ot5py655qE5pWI546H5piv5oyH55So5p2l5YGa5pyJ55So5Yqf55qE6IO96YeP5LiO54eD5paZ5a6M5YWo54eD54On5Lqn55Sf55qE6IO96YeP55qE5q+U5YC8
- 答案:RA==
54Ot5py655qE5pWI546H55qE6auY77yM5piv5oyH55So5p2l5YGa5pyJ55So5Yqf55qE6IO96YeP5LiO54eD5paZ5a6M5YWo54eD54On5Lqn55Sf55qE6IO96YeP55qE5q+U5YC85aSn77yM5Y2z77ya6L2s5YyW55qE5py65qKw6IO95Y2g54eD5paZ5a6M5YWo54eD54On5pe25pS+5Ye654Ot6YeP55qE55m+5YiG5q+U5aSn77yM5bm26Z2e5oyH55qE5rip5bqm6auY44CB5Yqf546H5aSn77yM5Lmf5LiN6IO96K+05piO5Zyo5Y2V5L2N5pe26Ze05YaF5raI6ICX55qE54eD5paZ5aSa5bCR77yM5pWFQUJD6ZSZ44CBROato+ehru+8juaJgOS7peetlOahiOS4ukTvvI4=
本课配套习题挑战模式5/5
单选题
难度系数:
5.下列因素中不会影响内燃机机械效率的是( )
A: 内燃机使用的燃料的热值不大 |
B: 燃料燃烧不完全,要损失一部分能量 |
C: 排出的废气温度较高,要带走一部分能量 |
D: 一部分能量消耗在散热及克服摩擦做功上 |
一次做对,真牛!
+5奖励规则>
- 提示1:5YaF54eD5py655qE5pWI546H5piv5oyH55So5p2l5YGa5pyJ55So5Yqf55qE6IO96YeP5LiO54eD5paZ5a6M5YWo54eD54On5Lqn55Sf55qE6IO96YeP5LmL5q+U
- 答案:QQ==
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