问题
选择题
下列各个装置中能组成原电池的是（ ）
A．
稀硫酸
B．
Cu2SO4溶液
C．
酒精溶液
D．
答案
A、两电极的活泼性相同，故A错误；
B、符合原电池的构成条件，故B正确；
C、不能自发的进行氧化还原反应，故C错误；
D、不能形成闭合回路，故D错误；
故选B．
搜题请搜索小程序“爱下问搜题”
下列各个装置中能组成原电池的是（ ）
A．
稀硫酸
B．
Cu2SO4溶液
C．
酒精溶液
D．
A、两电极的活泼性相同，故A错误；
B、符合原电池的构成条件，故B正确；
C、不能自发的进行氧化还原反应，故C错误；
D、不能形成闭合回路，故D错误；
故选B．
| 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. | ||||
|