A:西藏
B:贵州
C:新疆
D:云南
Hello! My name is Peter. I am a student. I often have busy days. I ____ at 6:30 in the morning. I ____ at home. Then I ____ at 7:10. I____ at 7:30. I ____ at 11:45. In the afternoon, we ____ class. After school, I ____ with my friends. In the evening, I ____ or ____ . I____ at 9:00. This is my day.
一灵敏电流计,允许通过的最大电流(满刻度电流)为Ig=50μA,表头电阻Rg=1kΩ,若改装成量程为Im=1mA的电流表,应并联的电阻阻值为____Ω,若将改装后的电流表再改装成量程为Um=10V的电压表,应再串联一个阻值为____Ω的电阻.(结果保留四位有效数字)
《大公报》社评曾对某战事评论说:“自上月20日以来,我军在北方发动了大规模的运动战。平汉、正太、同蒲三路同时发动反攻,铁路到处被破坏,冀晋豫三省同时报捷。”。此“战事”的重大意义在于( )