已知X、Y元素同周期,且电负性X>Y,下列说法错误的是() A.X与Y形成化合物

题型:选择题

问题:

已知X、Y元素同周期,且电负性X>Y,下列说法错误的是(   )

A.X与Y形成化合物,X可以显负价,Y显正价

B.第一电离能可能Y小于X

C.最高价含氧酸的酸性:X对应的酸性弱于于Y对应的

D.气态氢化物的稳定性:HmY小于HnX

考点:构成物质的粒子—分子、原子、离子元素周期律
题型:选择题

下面说法中,正确的在括号里打“√”,错误的打“×”。

一个口袋里装有7个红球,3个白球,任意摸出1个。

(1)摸出红球的机会大。[ ]

(2)不可能摸出白球。[ ]

(3)摸出白球的可能性比较小。[ ]

(4)摸出黑球的机会小一些。[ ]

题型:选择题
Once upon a time, there was a group of forest deer.In this group was a wise and respected   36 , smart in the ways of deer.He taught the tricks of   37   to the fawn-the young deer.
One day, his younger sister   38  her son to him, to be taught   39  is so important for deer.The teacher said to the fawn, “Very well, you can come at this time tomorrow for your first   40 .”
At first, the young deer came to the lessons as he was  41  to.But soon, he became more interested in   42  with the other young bucks(雄鹿).He didn’t realize how   43  it could be for a deer who learned   44  but deer games.So he started 45 .Soon he was escaping school all the time.
46 , one day the fawn who stayed away from school   47  a snare(陷阱)and was trapped.Since he was   48 , his mother got worried.She went to her brother the teacher, and    49   him if her son had learned something.The teacher   50  ,“My dear sister, your son was disobedient and   51 .Out of respect for you, I   52   to teach him.But he did not want to learn the   53  of deer.He escaped school! How could I possibly teach him?”
Later they heard the sad news.The  54   fawn had been trapped and killed by a hunter.He skinned him and took the meat home to his family.
The moral is: Nothing can be learned from a teacher by one who   55  the class.
小题1:
A.studentB.motherC.teacherD.magician
小题2:
A.performB.survivalC.huntingD.hiding
小题3:
A.broughtB.caughtC.arrangedD.referred
小题4:
A.thatB.whichC.howD.what
小题5:
A.arrivalB.punishmentC.prizeD.lesson
小题6:
A.preservedB.thoughtC.supposedD.suspected
小题7:
A.learningB.playingC.talkingD.fighting
小题8:
A.interestingB.boringC.dangerousD.useful
小题9:
A.nothingB.somethingC.allD.none
小题10:
A.working hardB.cutting classesC.playing gamesD.teaching others
小题11:
A.LuckilyB.UnexpectedlyC.DefinitelyD.Unfortunately
小题12:
A.found outB.set upC.stepped inD.got over
小题13:
A.dyingB.missingC.unhappyD.improving
小题14:
A.toldB.scoldedC.askedD.suspected
小题15:
A.repliedB.analyzedC.advisedD.questioned
小题16:
A.unbelievableB.unteachableC.unflexibleD.unimportant
小题17:
A.made up my mindB.tried my bestC.gave upD.would like
小题18:
A.storiesB.structuresC.gamesD.tricks
小题19:
A.proudB.sickC.stubbornD.shy
小题20:
A.missesB.lovesC.formsD.attends
题型:选择题

在做托里拆利实验时,下列情况会使测量结果不准确的是

A.往水银槽中多加些水银

B.从山脚移到山顶做实验

C.将玻璃管稍微倾斜一些

D.玻璃管内混入空气

题型:选择题

按照广东农村信用社手工批量开户业务的规定,以下属于委托人递交时需加盖委托单位公章的材料是()

A.批量开户清单

B.开户人的有效证件的复印件

C.《开立个人银行结算账户账户申请书》

D.《借记卡业务申请表》

题型:选择题

压裂车台上柴油机工作转速应为()。

A.最大转速

B.最小转速

C.额定转速

D.任意转速

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