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Every chemical change either results from energy b
Every chemical change either results from energy being used to produce the chang
The doctor ________ an X-ray test, and then, he co
The doctor ________ an X-ray test, and then, he could be make a conclusion.A. ur
3.酯的通式是( )。A.RCOR.B.RCOR.C.RCOOR.D.RCOOHE.RCHO
3.酯的通式是( )。A.RCOR.B.RCOR.C.RCOOR.D.RCOOHE.RCHO
下列反应过程可自发进行的是(A )
下列反应过程可自发进行的是(A )
Who will teach _____English next term? （分数：1 分） A.
Who will teach _____English next term? （分数：1 分） A. us B. you C. our D. your