Neither he nor I am a musician, _____?
Neither he nor I am a musician, \_\_\_\__?
连接
The World’s Fair won’t be a financial success _____ there are enough visitors.
The World’s Fair won’t be a financial success \_\_\_\__ there are enough visitors.
There are different forms of energy, _____ come from the sun.
There are different forms of energy, \_\_\_\__ come from the sun.
Not only he but also we _____ right. He, as well as we, _____ right.
Not only he but also we \_\_\_\__ right. He, as well as we, \_\_\_\__ right.
一理想变压器原线圈的匝数为800，连接在的交流电源上；副线圈的匝数为200，与交流电压表相接，则此交流电压表的读数是____v．
一理想变压器原线圈的匝数为800，连接在的交流电源上；副线圈的匝数为200，与交流电压表相接，则此交流电压表的读数是\_\_\_\_v．
如图6所示，MN、PQ为足够长的平行金属导轨，间距L＝0.50米，导轨平面与水平面间夹角θ＝37°，N、Q间连接一个电阻R＝5.0欧姆，匀强磁场垂直于导轨面向上，磁感应强度B＝1.0特斯拉．将一根质量m＝0.050千克的金属棒放在导轨的ab位置，金属棒及导轨的电阻不计．现由静止释放金属棒，金属棒沿导轨向下运动过程中始终与导轨垂直，且与导轨接触良好，已知金属棒与导轨间的动摩擦因数，当金属棒滑行至cd处时，其速度大小开始保持不变，位置cd与ab之问的距离s＝2.0米．已知sin37°＝0.60，cos37°＝
如图6所示，MN、PQ为足够长的平行金属导轨，间距L＝0.50米，导轨平面与水平面间夹角θ＝37°，N、Q间连接一个电阻R＝5.0欧姆，匀强磁场垂直于导轨面向上，磁感应强度B＝1.0特斯拉．将一根质量m＝0.050千克的金属棒放在导轨的ab位置，金属棒及导轨的电阻不计．现由静止释放金属棒，金属棒沿导轨向下运动过程中始终与导轨垂直，且与导轨接触良好，已知金属棒与导轨间的动摩擦因数，当金属棒滑行至cd