如图所示,闭合开关后,要使L1和L2都发光,甲是__________表;乙是 ______表。
电流;电压
The moment I saw him, his name simply ________ me, and I stood there not knowing how to
address him.[ ]
A. chokes
B. escaped
C. failed
D. confused
简述迷宫式密封的工作原理。