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【单选题】
关于摩擦力对物体做功,以下说法中正确的是 [ ]
A.
滑动摩擦力总是做负功
B.
滑动摩擦力可能做负功,也可能做正功
C.
静摩擦力对物体一定做负功
D.
静摩擦力对物体总是做正功
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举一反三
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【多选题】In the 1930s, Lin Yutang’s My Country and My People (1935), and The Importance of Living (1937), became best-sellers.( )
A.
My Country and My People
B.
The Flower Drum Song
C.
The Importance of Living
D.
Fifth Chinese Daughter
【单选题】在移动路径的操作中,需在水平、垂直或者 45° 方向上移动路径要同时按住的键是
A.
Alt
B.
Ctrl
C.
Shift
D.
Tab
【单选题】常见的机翼结构型式为
A.
上单翼、中单翼、下单翼
B.
桁梁式、桁条式、蒙皮式
C.
布质蒙皮机翼、金属蒙皮机翼
D.
梁式、单块式、多腹板式
【简答题】One of my foreign friends thinks that it is worth ______ (visit) my country.
【单选题】常见的机翼结构型式为
A.
上单翼、中单翼、下单翼.
B.
桁梁式、桁条式、蒙皮式.
C.
布质蒙皮机翼、金属蒙皮机翼.
D.
梁式、单块式、夹层与整体结构机翼.
【简答题】The Read family come to a new big city, but Mrs. Read’s son, Bob, is not happy. He doesn’t have anyone to play with. “Don’t worry!” says his mother. “You will soon make friends here.” One morning, the...
【单选题】血中激素浓度极低但生理作用非常明显的原因是( )
A.
激素的半衰期很长
B.
激素的特异性很高
C.
激素分泌的持续时间很长
D.
细胞内存在高效能的生物放大系统
E.
与血浆蛋白结合率低
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