[单项选择]So little ______ about China that he could not find Beijing in the world map. A. the foreigner knew B. did the foreigner know C. the foreigner has known D. has the foreigner known
第2题: [单项选择]做兆欧表的开路和短路试验时,转动摇柄的正确做法是()。 A. 快速摇动加速至120r/min,指针稳定后快速减速至停止 B. 快速摇动加速至120r/min,指针稳定后缓慢减速至停止 C. 缓慢摇动加速至120r/min,指针稳定后缓慢减速至停止 D. 缓慢摇动加速至120r/min,指针稳定后快速减速至停止 参考答案:C