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1. Do you have part-time job? Is it good for students to have part-time jobs? Why? 2. Pollution is a global problem. What should we do, in your opinion, to protect our environment?

1.1用真值表证明下列恒等式 (1)⊕B=A⊙B=AB1 (2)A(B⊕C)=AB⊕AC (3)(A+B)(A+C)(B+C)=(a+B)(a+C)

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