【单选题】6月5日是“世界环境日”。2007年“世界环境日”的主题是“冰川消融,后果堪忧”。在中国,高原冰川以每年减少相当于整条黄河年流量的速度在递减,后果堪忧。已知大气中二氧化碳浓度增大可造成气温升高。下列不符合该主题的是 [ ]
【简答题】I am sure you will find plenty to interest you.
【单选题】在深度负反馈电路中,若反馈系数F减小50%,闭环放大倍数Af将近()。
【单选题】德布罗意在光的波粒二象性的启发下想到了什么?
【单选题】在深度负反馈放大电路中,若反馈系数 F增加一倍,闭环增益 A f 将 [ ]
【单选题】reading TEXT1 2.What are NOT included in tool kits?
【单选题】You have made outstanding contributions to the company---I am sure you ___ get promoted this year.
【简答题】—My goodness! I just missed the train. —That’s too bad. I am sure you ______ it if you had hurried. A.would catch B.would have caught C.could catch D.had caught