单项选择题 龈上洁治器刀刃与牙面的工作角度约为？ A、0° B、10° C、15° D、45° E、80°

判断题 生产就是消费,消费就是生产。( )正确错误

判断题 Your thank-you letter is not supposed to include any new information about your education or work experience that you believe would increase your chance of getting the position but was not included in your application letter or in interview. 正确 错误