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【单选题】
下列各式从左到右的变形不正确的是（ ）A.
-2x 3y =- 2x 3y
B.
-y -6x = y 6x
C.
- -8x 3y = 8x -3y
D.
3x -4y =- 3x 4y
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皮皮学刷刷变学霸
举一反三
【单选题】This contract will _________ as soon as it is signed by two parties.
A.
come into useful
B.
come into available
C.
come into valid
D.
come into force
【单选题】This contract will come into as soon as it is signed by the two parties.
A.
being
B.
force
C.
form
D.
effect
【单选题】This contract will come into as soon as it is signed by the two parties.
A.
being
B.
force
C.
form
D.
affect
【简答题】在Word的普通视图中，不可以显示首字下沉效果。（ ）
【简答题】This contract will come into as
soon as it is signed by the two parties.A. being B. force C. form D. effect
【简答题】简述微波元器件中有源元器件和无源元器件在微波电路中的作用。
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