判断题 检修时误认为设备无电，但实际上却有电的情况，必须用验电来确保设备 无电源，也就是说，在装设接地线前无需先进行验电

单项选择题 如果直方图峰值位置偏向灰度值大的一边，图像偏暗。 A、正确 B、错误

单项选择题 Read the information and answer the following 3 questions. Larry’s Lawn Service provides lawn care in a planned community where all lawns are approximately the same size. At the end of May, Larry prepared his June budget based on mowing 500 lawns. Since all of the lawns are similar in size, Larry felt that the number of lawns mowed in a month would be the best way to measure overall activity for his business. At the end of June, Larry actually mowed 600 lawns. flexible budget format for Larry’s Lawn Service Number of lawns(Q)               Revenue/Cost Fomulas Revenue                                 75Q Expenses   Wages and Salaries             5000+30Q   Gasoline and supplies          9Q   Equipment maintenance       3Q    Office and Shop Utilities      1000   Office and shop rent            2000   Equipment Depreciation      2500   Insurance                            1000 What should the total expenses be in a flexible budget for 600? A、36,200 C、38,200