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【单选题】
抽汽循环中抽气级数却多，循环热效率越高，因为抽汽级数越多， 。A.
抽气量越大，循环加热量就越小
B.
抽气量越大，循环的放热量就越小
C.
平均放热温度越低，平均吸热温度就越高
D.
平均放热温度不变，平均吸热温度就越高
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举一反三
【简答题】Some American universities have already established local degree-granting branches in China.
【单选题】In response to the fact that ______, more American students are learning Chinese.
A.
the United States is the only superpower in the world
B.
international trading is becoming globalized
C.
partnership is encouraging business and trade
D.
China is emerging as a new superpower in the world
【单选题】若要把当前窗口的全部信息复制到剪贴板中,则可按快捷键( )。
A.
Ctrl+Print Screen
B.
Print Screen
C.
A1t+Print Screen
D.
Shift +Print Screen
【简答题】简述美容外科学的概念
【单选题】In response to the fact that ______, more American Students are learning Chinese.
A.
the United States is the only superpower in the world
B.
international trading is becoming globalized
C.
partnership is encouraging business and trade
D.
China is emerging as a new superpower in the world
【单选题】以下关于力的结论中,哪个是正确的?
A.
合力一定大于分力
B.
三力平衡的充分必要条件是“三力平衡必汇交于一点”
C.
作用于刚体上的力可沿其作用线移动而不改变它对刚体的作用效应
D.
平面任意力系的主矢就是该力系的合力
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