如右图为理想变压器原线圈所接电源电压波形，原副线圈匝数之比n1∶n2 = 10∶
题型：选择题
问题：
如右图为理想变压器原线圈所接电源电压波形，原副线圈匝数之比n1∶n2 = 10∶1，串联在原线圈电路中电流表的示数为1A，下列说法正确的是（ ）
A．变压器输出两端所接电压表的示数为
V
B．变压器输出功率为220
W
C．变压器输出的交流电的频率为50HZ
D．该交流电每秒方向改变50次
题型：选择题
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| For 52 years my father got up every morning at 5: 30 a. m., except Sunday, and went to work.I __1__saw my father home from work ill.He had no hobbies, __2__taking care of his family. For 22 years, __3__I left home for college, my father__4__me every Sunday at 9?00 a. m..He was always interested in my__5__, or how my family was doing, and I never once heard him__6__ about his lot (生活状况) in life.The calls even came when he and my mother were in other states. Nine years ago when I__7__my first house, my father,67 years old, spent three days__8__my house.He would not__9__me to pay someone to have it done.All he __10__was a cup of tea, a paint brush and to talk to him.But I was too__11__.I had a law practice to run, and I could not take__12__ to hold the brush, or talk to my father.__13__things happened several times later. The morning on Sunday.January 16,1996, my father telephoned me__14__, this time from my sister's home in Florida.But the__15__came again at 4?40 p. m.that day.My father was in the__16__in Florida with an aneurysm (动脉瘤). I got on an airplane__17__, and on the way, I__18__of all the times I had not taken the time to talk to my father.I determined that when I arrived, I would__19__for the lost time, and have a nice long talk with him. I arrived in Florida at 11:30 p. m., my father had__20__at 9?12 p. m..This ti  me it was he who did not have ti  me to talk, or to wait for me. | ||||
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