问题
多选题
如图所示，理想变压器原线圈接u=220 sin100πt （V）的 正弦交流电源，图中电流表内阻不计．副线圈接入“110V，60W”灯泡一只，且灯光正常发光．下列说法正确的是（ ）A．电流表的示数为3/11 A B．通过灯泡的电流的频率为50Hz C．电流表的示数为3 D．理想变压器原、副线圈匝数之比为2  |
/22 A
答案
AB
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| 如图所示，理想变压器原线圈接u=220sin100πt （V）的 正弦交流电源，图中电流表内阻不计．副线圈接入“110V，60W”灯泡一只，且灯光正常发光．下列说法正确的是（ ） A．电流表的示数为3/11 A B．通过灯泡的电流的频率为50Hz C．电流表的示数为3 D．理想变压器原、副线圈匝数之比为2 |
AB
Mr. and Mrs. Green were very worried about their son, Leo. He seemed to be dumb( 哑的） he was normal in every other way. Mr. and Mrs. Green tried everything to get him to ,but with no success.When Leo was six years old, the best doctors in the town him carefully, but could find nothing wrong. And he seemed to be smart. It was just that he _ spoke. “There might be something wrong with his ，and he doesn’t know he's able to speak，’，one doctor said.“But he can read and write，，，said Mr. Green. “We’ve written him notes, telling him that he can speak. ”“It’s certainly very ，” another doctor said. Perhaps he’ll be able to speak some day. ” passed. Leo went to university. But he did not say a word. Then one day,Leo was having a meal with his parents. Without any warning, he looked up from his and said，“Pass me the salt,please. ” Mr. and Mrs. Green were excited. “You spoke! You spoke!” they cried. “ Why have you so long to speak?” “I didn’t have anything to say，，，he said. “Until now everything was perfect. But you forgot to put salt in potatoes. ”
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