计算(-3)2+(12)-2×(π-3)0-4+tan45∘.

题型:解答题

问题:

计算(-3)2+(
1
2
)
-2
×(π-
3
)
0
-
4
+tan 45
考点:零指数幂(负指数幂和指数为1)二次根式的定义实数的运算特殊角三角函数值
题型:解答题

关于不同细胞分离方法的综合评价,说法错误的是()

A.早期的分离技术根据物理属性和生物属性进行分离的

B.早期的分离技术用目前的灵敏度和分辨率来比较是低的,所以在目前已经被取代

C.近期的分离技术根据细胞表面标志进行分离细胞,以细胞亲和层析为代表

D.近期的分离技术有细胞固相包被技术、细胞淘洗技术、磁珠分离技术及流式细胞术等

E.以细胞表面标志物为分离标志的细胞分离技术目前尚不能完全替代经典的细胞分离技术

题型:解答题

历史教师在介绍我国某一原始人类时,提到“他们生活在距今约70-20万年,已经会使用天然火,过着群居的生活”,此原始人类应该是()

A.元谋人

B.北京人

C.山顶洞人

D.半坡人

题型:解答题
In a land far away, once upon a time there was great poverty (贫困),and only the rich could manage without great _26_. Three of those rich men and their servants were_27_together on a road when they came to a very_28_village.
The first could not stand seeing the poverty, _29  he took all the gold and jewels from his wagons (四轮载重马车) and shared _30 out among the villagers. He wished them all the best of luck, and he left.
The second rich man ,seeing the _31  situation, stopped for a short time and gave _32  all his food and drink, since he _33  see that money would be of little _34  to them. He made sure that they each _35  their fair share and would have enough food to _36  for some time . Then, he left.
The third rich man, on seeing such poverty, _37  and went straight through the _38  without stopping. The two other rich men saw this from a distance and commented with each other_39  the third rich man lacked sympathy. It was _40  that they themselves had been there to offer help.
However, three days later, they  41 the  third rich man ,who was coming in the opposite direction . He was  42  travelling quickly, but his wagons,  43  the gold and valuables they had been  44  ,were now full of farming tools and bags of  45  .He was rushing back to help them out of poverty.
小题1:
A.lossB.expectationsC.successD.problems
小题2:
A.standingB.travellingC.gatheringD.running
小题3:
A.farawayB.poorC.differentD.ancient
小题4:
A.unlessB.becauseC.soD.if
小题5:
A.themB.anythingC.nothingD.those
小题6:
A.curiousB.worryingC.dangerousD.puzzling
小题7:
A.the villagersB.his servantsC.the othersD.the rest
小题8:
A.couldB.mightC.shouldD.must
小题9:
A.interestB.concernC.useD.attraction
小题10:
A.returnedB.gainedC.offeredD.received
小题11:
A.remainB.lastC.supplyD.share
小题12:
A.turned backB.set outC.showed offD.speeded
小题13:
A.villageB.landC.fieldD.road
小题14:
A.whetherB.howC.whereD.when
小题15:
A.goodB.certainC.trueD.strange
小题16:
A.welcomedB.metC.tacceptedD.persuaded
小题17:
A.stillB.alreadyC.alwaysD.indeed
小题18:
A.exceptB.instead ofC.apart fromD.along with
小题19:
A.loadingB.treasuringC.carryingD.earning
小题20:
A.foodB.jewelsC.moneyD.seeds
题型:解答题

不断调整体系的灵活性和创新性以及在整个企业内部优化流动资金,可以通过某些途径实现,这些途径包括( )。

A.保持不断更新以适应当地的实际情况

B.使用最先进的国家和区域的解决方案进行收款

C.使用最先进的国家和区域的解决方案进行付款

D.使用最先进的国家和区域的解决方案进行转账

题型:解答题

锌的生理功能是()。

A.酶学效应

B.促进生长发育与组织再生

C.维持生物膜结构和功能

D.参与构成味觉素

E.以上全是

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