在用电压表和电流表测电阻的实验中,由于电表内阻对测量的影响,使得测量的结果会出现

题型:选择题

问题:

在用电压表和电流表测电阻的实验中,由于电表内阻对测量的影响,使得测量的结果会出现误差。若采用右图所示的电路进行测量,则测量值RX与实际值R0比较

A.RX>R0

B.RX<R0

C.RX=R0

D.因不知两表的内阻具体大小,故无法比较RX与R0的大小关系

考点:实验:伏安法测电阻实验:练习使用示波器实验:测绘小灯泡的伏安特性曲线实验:探究影响导体电阻的因素
题型:选择题

Many people stood near the bus stop, nervously waiting ______.

A.to pick up

B.picking up

C.to be picked up

D.being picked up

题型:选择题

已知一个多位数的个位数字为m,且这个多位数的任何次幂的个位数字仍为m,那么这个数字m                                                               (      )

A.可能是0和1

B.只能是0

C.只能是1

D.以上都不对

题型:选择题

患儿,男,2岁,表情呆板,眼距宽,眼裂小,皮肤干燥,毛发稀少,眼睑浮肿不爱活动,鼻梁宽平,实验室检查:T3T4低,TSH高,最可能的疾病是()

A.先天性甲低症

B.21-三体综合征

C.垂体性侏儒症

D.苯丙酮尿症

E.糖原累积症

题型:选择题
Carly Zalenski’s eyes were filled with tears as the dusty bus ran down a dirt road in southern Vietnam. She and her parents had travelled to Ho Chi Minh City by plane from Canton, Ohio of the USA. As they became     to the village, hundreds of cheering      stood in lines at the     to the Hoa Lac School, a two-story building that Carly had     money for.
Carly started helping      when she was eight. She often walked about to send Thanksgiving baskets at church to families in need. When she saw one girl      very little in a snowy day and others didn’t have warm    , she went door-to-door asking for      coats, hats, gloves, and scarves, then handed them    to the poor families with the baskets.
However, Carly wanted to do    more—she wanted to “change these children’s     with her efforts”. She remembered that her grandmother’s Rotary club had collected money to build a     in Vietnam a few years ago. She wanted to build a school,     .
She put together a short show on the people and culture of Vietnam to his audience.    her new braces(脚支架) made it      to make the speech, she was full of enthusiasm, “I want to give them a place to    their lives better.”
That summer, Carly    with her family across Ohio, visiting three or four Rotary clubs a week. “We travelled like     people to all these meetings,” said her mother. In two years, Carly had raised $50,000. At the donation   in Hoa Lac, the school principal was deeply   by the little girl. “How wonderful it is,” he said, “that a girl at her age wants to do something for kids so far away.”
小题1:
A.fartherB.closerC.higherD.faster
小题2:
A.adultsB.farmersC.workersD.children
小题3:
A.entranceB.centreC.topD.exit
小题4:
A.collectedB.borrowC.savedD.earned
小题5:
A.anotherB.the othersC.othersD.the other
小题6:
A.wearingB.putting onC.dressingD.taking off
小题7:
A.housesB.bedsC.clothesD.food
小题8:
A.newB.beautifulC.usedD.broken
小题9:
A.outB.upC.backD.over
小题10:
A.anythingB.somethingC.everythingD.nothing
小题11:
A.moodsB.worksC.studiesD.lives
小题12:
A.churchB.villageC.libraryD.school
小题13:
A.eitherB.alsoC.tooD.neither
小题14:
A.BecauseB.UnlessC.AlthoughD.When
小题15:
A.hardB.funnyC.easyD.happy
小题16:
A.remainB.makeC.turnD.allow
小题17:
A.set offB.take offC.turn offD.pay off
小题18:
A.sickB.disabledC.crazyD.friendly
小题19:
A.ceremonyB.traditionC.currencyD.condition
小题20:
A.surprisedB.pleasedC.excitedD.touched
题型:选择题

常用的抽样方法中,分层抽样的优点是______。

A.便于组织、节省经费
B.易于理解、简便易行
C.样本代表性好,抽样误差减少
D.操作简单,均数、率及相应的标准误计算简单

更多题库