问题
多选题
如图所示，理想变压器原副线圈匝数之比为4：1，原线圈接入一电压为u=220 sin100πtV的交流电源，副线圈接一个R=27.5Ω的负载电阻．则下述结论正确的是（ ）A．副线圈中电压表的读数为55V B．副线圈中输出交流电的周期为0.01s C．原线圈中电流表的读数为0.5A D．原线圈中的输入功率为110  |
W
答案
AC
搜题请搜索小程序“爱下问搜题”
| 如图所示，理想变压器原副线圈匝数之比为4：1，原线圈接入一电压为u=220sin100πtV的交流电源，副线圈接一个R=27.5Ω的负载电阻．则下述结论正确的是（ ） A．副线圈中电压表的读数为55V B．副线圈中输出交流电的周期为0.01s C．原线圈中电流表的读数为0.5A D．原线圈中的输入功率为110 |
AC
根据句意选择单词或短语，并用适当形式填空（每词只能使用一次，有两个多余选项）。
小题1:His bad habits of reading in bed _____ his eye-sight． As a result, he had to wear glasses． 小题2: Employees with skills ________ in joint-venture enterprises． 小题3:The performances given by these young people succeeded in _______ a dull play ______． 小题4: At last, my little son _____ to put his whole heart into his studies at school so as to keep up with others． 小题5:In teaching a foreign language, it is important for teachers _____ new teaching methods ___ our teaching process． 小题6:Teaching is an art ______ science． 小题7:Which students ____ the teacher ______when she spoke of the most promising ones? 小题8:On account of his illness, he ___ never ________． 小题9:It is ______ for anyone to laugh at those who are in trouble． 小题10:Many teenagers love to watch a conjurer _______ tricks． |
（）