选择题:Which of the following is not included in a letter 题目分类:管理英语1 题目类型:选择题 查看权限:VIP 题目内容: Which of the following is not included in a letter of invitation?选择一项:a. Purpose.b. Place.c. Weather. 参考答案:
功率放大器的效率是指( ) 功率放大器的效率是指( ) A.输出功率与输入功率之比 B.输出功率与电源提供的功率之比 C.输入功率与电源提供的功率之比 D.电源提供的功率与输出功率 分类:管理英语1 题型:选择题 查看答案