问题
多选题
| 理想变压器原线圈接在如图所示的电压上，原副线圈匝数之比为10：1，串在原线圈上的电流表的示数为1A，则以下叙述正确的是（ ） A．变压器输出功率为200W B．若n1=100匝，则输出端线圈的磁通量变化率的最大值为2 C．副线圈两端的电压表示数20 D．变压器的输入功率是由发电厂的输出功率决定的  |
Wb/s
V
答案
AB
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| 理想变压器原线圈接在如图所示的电压上，原副线圈匝数之比为10：1，串在原线圈上的电流表的示数为1A，则以下叙述正确的是（ ） A．变压器输出功率为200W B．若n1=100匝，则输出端线圈的磁通量变化率的最大值为2 C．副线圈两端的电压表示数20 D．变压器的输入功率是由发电厂的输出功率决定的 |
AB
| 完形填空 | ||||
| It was the summer of 1965.DeLuca,17, visited Buck, a family friend.Buck asked DeLuca about his __1__for his future."I'm going to college, but I need a(n)__2__to pay for it, " DeLuca__3__saying, "Buck said, 'You should open a sandwich shop.'" They agreed to be__4__.And they set a__5__:to open thirty stores in ten years.After doing some research, Buck wrote a check for $1,000.DeLuca__6__a storefront (店面), and when they couldn't __7__their startup costs, Buck kicked in another $1,000. But business didn't go smoothly as they__8__.DeLuca was__9__the store and going to__10__at the same time.Buck was working at his day job as a nuclear physicist in New York.They'd__11__on Monday evenings and brainstorm ideas for keeping the business running.They__12__themselves to__13__a second store.And they did in the spring of 1966. The partners' learnasyougo approach turned out to be their greatest__14__.Every Friday, DeLuca would drive around and handdeliver the checks to pay their__15__."It took me two hours and it wasn't __16__, but as a result, the suppliers got to know me well, and the personal__17__established really helped out, " DeLuca said. And having a goal was also important."There are so many__18__that can get you down.You just have to__19__working toward your goal, " DeLuca adds. DeLuca__20__founding Subway Sandwich, the multimilliondollar restaurant chain. | ||||
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