第25题: [单项选择]{{B}}Questions 11 to 18 are based on the passage you have just heard.{{/B}} A. Miss Brown does not know how to paint. B. Miss Brown will teach art. C. Miss Brown will teach English. D. Miss Brown will not go to the high school. 参考答案:B 答案解析:[听力原文]
M: Miss Brown bought some paper, paints, and brushes.
W: I’ll bet she’ll use them at the hi
第30题: [单项选择]下列各式可以作向量图分析的是()。 A. i1=I1sinωt,i2=I2sin(3ωt+60°),求i1+i2 B. u1=U1sin(ωt+45°),u2=U2sin(ωt-45°),求u1-u2 C. i1=I1sin(ωt+30°),i1=I2sin(3ωt-30°),求i1-i2 D. 以上三式均可 参考答案:B