题目内容

7∠20°×3∠60°=21∠80°

A. 对
B. 错

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(5+j3)(6-j4)=30+j12

A. 对
B. 错

1.InCarson’sopinion,whatledtotheinsectproblem?

2.Whatisthedifferencebetweenthenaturalspreadingofspeciesandtheman-assistedprocess?Andhowdoesthisprocesscontributetothepestproblem?

1.Whatshouldwedotosolvepestproblems?

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