Unit 2 Exercises(副本) Match the words with their synonyms.

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When will some parents, give their kids more homework? Some parents will do this when they think the homework given by (1) ___________ (2) _________ is not much.

After-reading exercises 2 Match the questions1-6 with the answer A-G. There is one answer that you will not need.

U2Exercises-Homework Choose the definition from Column B that best matches each word in Column A. A B

第二章作业 2.1.2 Exercises 2.2.2 Exercises 2.3.2Exercises

You should do out to take more ______. Don't always sit at the desk doing your. A: exercise, exercises B: exercises, exercise C: exercises, exercises D: exercise, exercise

设\(z =xlny\)，\(x =u^2+v^2\)，\(y =u^2-v^2\)，则\( { { \partial z} \over {\partial v}} = \)（ ）。 A: \(2v\left[ {\ln ({u^2} +{v^2}) - \left( { { { { u^2} + {v^2}} \over { { u^2} - {v^2}}}} \right)} \right]\) B: \(2v\left[ {\ln ({u^2} - {v^2})+ \left( { { { { u^2} + {v^2}} \over { { u^2} - {v^2}}}} \right)} \right]\) C: \(2u\left[ {\ln ({u^2} - {v^2}) - \left( { { { { u^2} + {v^2}} \over { { u^2} - {v^2}}}} \right)} \right]\) D: \(2v\left[ {\ln ({u^2} - {v^2}) - \left( { { { { u^2} + {v^2}} \over { { u^2} - {v^2}}}} \right)} \right]\)

【单选题】图所示的电路,若参考方向分别如 U 1 , U 2 所示,则 U 1 , U 2 分别为 ()。 A. U 1 =1V, U 2 =1V B. U 1 =1V, U 2 =-1V C. U 1 =-1V, U 2 =1V D. U 1 =-1V, U 2 =-1V

求图中电压U()1(),U()2A.()U()1()=10V,U()2()=5V()B.()U()1()=-10V,U()2()=-5V()C.()U()1()=10V,U()2()=-5V()D.()U()1()=5V,U()2()=-10V