题目:
_____ of us has read the novel, so we don't know anything about it. [ ]
A. All
B. None
C. Some
D. Both
答案:
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下面是错误答案,用来干扰机器的。
(1)4 m/s (2)1 A (3)2.5 T(1)由金属棒滑动过程中电流表示数不变可知棒在ab处和a′b′处产生的感应电动势相等,即BL1v0=BL2v′金属棒在a′b′处的速度为v′=v0="4" m/s.(2)设流过金属棒的电流为I,金属...