第18题: [单项选择]部分电路欧姆定律的数字式是()。 A. I=U/R B. I=R/U C. U=R/I D. U=I/R 参考答案:A
第19题: [单项选择]Questions 144-146 refer to the following notice. Season tickets for this year’s symphony are going on sale next month and we wanted you to be among the first to know.A. could force B. could have forced C. could be forced D. could have been forced 参考答案:C 答案解析:这句话的意思是说,若没有您的支持,Arrington交响乐团的员工将在25周年庆典之前被迫退休。考查对一般将来时的虚拟语气及force一词的被动用法。