【单选题】Jack London wrote the following works except ________.
【判断题】道岔转辙器上需要确定最小轮缘槽和尖轨动程的几何尺寸来保障行车安全。
【简答题】9#道岔直尖轨动程为(),曲尖轨动程为()。
【单选题】Why won’t the speaker tell Jack about London?
A.
He can learn about London by reading books and looking a t pictures.
B.
Jack has been studying in London and he knows it well.
C.
Jack doesn’t like London.
【单选题】如图所示电路,电源电压为 6V ,开关闭合后电压表示数为 3.8V ,则( )
【单选题】如图所示,开关闭合后,电压表 V 1 和 V 2 的示数分别为 10 V 和 4 V ,则灯 L 2 两端的电压为 [ ]
【单选题】— Jack's won ______ holiday in London. — ______ lucky fellow ! [ ]