【简答题】如图所示,闭合开关S,灯L 1 、L 2 都能发光,则甲是____表、乙是____表,此时甲、乙两表的示数之比为3:4,则L 1 、L 2 电阻之比为____。
【单选题】The()between the two playing periods of a football game is only a fewminutes.
【单选题】_________ the right kind of training, these teenage soccer players may one day grow into the international stars.
【简答题】如图所示,要使灯 L1 和 L2 串联,应该闭合开关 ,断开开关 ;如果要使灯 L1 与 L2 并联,则应该闭合开关 ,断开开关 ,如果三只开关全闭合,电路发生 。 (第一、二、三、四空填S1 或S2或S,有可能是三个开关之一,也有可能是三个开关中的两个或三个;第五空填“开路”或“短路”或“过载”)
【单选题】如图所示,当开关 S 1 、 S 2 都闭合时,能发光的灯是( )
【单选题】The last paragraph suggests that____.
A.
nuclear war will definitely not take place
B.
international agreements are now reached more and more easily
C.
man is beginning to realize that nuclear war is his greatest enemy
D.
world opinion is in favour of nuclear war
【单选题】External dangers usually enforce ______ harmony and subordination.
【简答题】如图11所示,开关S闭合时,通过灯L 1 、L 2 和L 3 的电流分别是0.4A、0.2A和0.8A,则电流表A 1 的示数为 ,A 2 的示数为 ,A 3 的示数为 ,A 4 的示数为