【判断题】毛泽东通过丰富的实践和调查研究,在国民革命失败后就确定了中国革命道路理论。
【单选题】The people of Kiribati worry that one day their country will be taken away by a sudden high tide.
【简答题】卤烷与 NaOH 在水和乙醇混合物中进行反应,指出哪些属于 S N 2 历程,指出哪些属于 S N 1 历程 ? (1) 产物构型完全转化 (2) 有重排产物 (3) 碱浓度增加反应速度增加 (4) 叔卤烷速度大于仲卤烷 (5) 增加溶剂的含水量反应速度明显增加 ( 6) 反应不分阶段,一步完成 (7)试剂亲核性愈强,反应速度愈快
【单选题】One day people will be able to go to the moon _____ holiday.
【判断题】One day, people will settle in the Antarctic regions as they have done in the Arctic regions
【单选题】Which of the following is NOT TRUE according to the passage?
A.
People will one day do shopping at home through a computer terminal.
B.
In many factories computerized robots have been used because they do not cause trouble and need no breaks.
C.
With the improvement of the microprocessor, more and more uses of computers will be found in the future.
D.
Computers will one day be used to help drivers.
【简答题】1在图 1-4-1中,各元件电压为 U 1 =- 5V , U 2 =2V , U 3 = U 4 =- 3V ,计算各元件的功率并指出哪些元件是电源,哪些元件是负载? 1.3 在图1-4-3中 , 已知 I =2A , 求 U ab 和 P ab 。 1.4 在图 1-4-4中,已知 I S =2A , U S =4V ,求流过恒压源的电流 I 、恒流源上的电压 U 及它们的功率,验证电路的功率...