20 The direction _______ a force acts is changeable.
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20 The direction _______ a force acts is changeable.
A. at which B. to which
C. in which D. on which
A. at which B. to which
C. in which D. on which
选D.
主要就是一个词组的介词搭配.
力作用于方向:a force acts on the direction.在句子中 on which a force acts 做The direction的定语,=that\which a force acts on.
act on ...作用于
全句的意思是:力可以改变方向.
主要就是一个词组的介词搭配.
力作用于方向:a force acts on the direction.在句子中 on which a force acts 做The direction的定语,=that\which a force acts on.
act on ...作用于
全句的意思是:力可以改变方向.
20 The direction _______ a force acts is changeable.
The direction a force acts can be
friction is a force that always acts an opposition movement
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