【单选题】______ the 632-meter Shanghai Tower is finished, it will be the second tallest building in the world. [ ]
【判断题】开路电压(V oc) 是指当太阳光照射下外电路电阻为无穷大时测得的电池输入电压;
【单选题】Which of the following is TRUE about Shanghai Tower?
A.
Shanghai Tower has one layer of glass, which is like one huge tube.
B.
Shanghai Tower distorts about 1 degree every 10 floors.
C.
Shanghai Tower consumes lots of energy, which is not economically affordable and practical.
D.
Shanghai Tower has curved façade and spiraling form which symbolizes the dynamic emergence of modern China.
【单选题】Standing on the top of the Oriental Pearl Tower, you will get a wonderful _______ of Shanghai city.
【多选题】继电器是一种自动控制电器,常用的继电器有()。
【判断题】继电器是一种电控制器件,在电路中能起到自动调节、安全保护、转换电路等作用。