钢筋弯曲机在弯曲未经冷拉或带有锈皮的钢筋时,应戴()。

A、绝缘手套
B、胸罩
C、防护镜
D、严禁站人
查看答案
正确答案:

C

答案解析:

暂无解析

上一题
你可能感兴趣的试题

名词解释:均小骨盆

软产道损伤造成阴道壁血肿的主要临床表现是()

A、血尿
B、阴道流血多
C、肛门坠胀感
D、子宫底上升

早产儿体重低于哪项应放入暖箱()

A、1000g
B、1500g
C、2000g
D、2500g

Theagriculturalrevolutioninthe19thcenturyinvolvedtwothings:theinventionoflabor-savingmachineryandthedeyelopmentofscientificagriculture.Labor-savingmachinerynaturallyappearedfirstwherelaborwasscarce.“InEurope,”saidThomasJefferson,“theobjectistomakethemostoftheirland,laborbeingabundant:hereitistomakethemostofourlabor,landbeingabundant.”ItwasinAmerica,therefore,thatthegreatadvancesin19thcenturyagriculturalmachineryfirstcame.

Attheopeningofthecentury,withtheexceptionofacrudeplowfarmerscouldhavecarriedpracicallyalloftheexistingagriculturalimplementsontheirbacks;by1860,mostofthemachineryinusetodayhadbeendesignedinanearlyform.Themostimportantoftheearlyinventionswastheironplow.Asearlyas1790CharlesNewboldofNewJerseyhadbeenworkingontheideaofacast-ironplowandspenthisentirefortuneinintrodueinghisinvention.Thefarmers,however,wouldhavenoneofit,claimingthattheironpoisonedthesoilandmadetheweedsgrow.Nevertheless,manypeopledevotedtheirattentiontotheplow,untilin1869JamesOliverofSouthBend,Indiana,turnedoutthefirstchilled-stillplow.?

1.Whatisthemaintopicofthepassage?

a.Theneedforagriculturaladvancestohelpfeedagrowingpopulation.

b.Thedevelopmentofsafermachinesdemandedbythelabormovement.

c.Machinerythatcontributedtotheagriculturalrevolution.

d.NewJerseyasaleaderintheagriculturalrevolution.

2.Theexpression“makethemostof”inLine4isclosestinmeaningtowhichofthefollowing?

a.getthebestyieldfrom

b.raisethepriceof

c.makefulluseof

d.earnalivingon

3.WhichofthefollowingcanbeinferredfromwhatThomasJeffersonsaid?

a.EuropewaschangingmorequicklythanAmerica.

b.EuropehadgreaterneedoffarmmachinerythanAmericadid.

c.Americawasfinallyrnningoutofgoodfarmland.

d.TherewasashortageofworkersonAmericanfarm.

4.Itcanbeinferredthatthewaord“here”inLine4refersto_____.a.Europe

b.America

c.NewJersey

d.Indiana

5.Whatpointistheautormakingbystatingthatfarmerscouldcarrynearlyalltheirtoolsontheirbacks?

a.Farmershadfewtoolsbeforetheagriculturalrevolution

b.Americansweretraditionallyself-reliant.

c.Lifeonthefarmwasextremelydifficult.

d.Newtoolsweredesignedtobeportable.

患儿11个月,因严重感染入院。体格检查发现肝、脾、淋巴结肿大,外周血检查:出现有核红细胞与幼稚中性粒细胞,Hb65g/L,可能出现的是()

A、红髓造血
B、黄髓造血
C、中胚层造血
D、骨髓外造血
热门试题 更多>
相关题库更多>
机电
电气
市政
水利
试卷库
试题库