保护地栽培的优点()A.设备费用大 B.技术要求高 C.生产费用高 D.不受地区、季

题型:单项选择题

问题:

保护地栽培的优点()

A.设备费用大

B.技术要求高

C.生产费用高

D.不受地区、季节限制

考点:农学花卉学花卉学题库
题型:单项选择题
Benjamin Franklin was a great scientist .He was the youngest of the  46   boys in his family . He was a clever boy,   47  cleverer than his nine brothers . He studied in school for only three years . He    48  to learn new things .He  49  worked on new ideas even when he was a child . There are a lot of stories about him and here’s one of them.
One day in winter Benjamin Franklin learned from one of his   50    that something black in colour holds heat    51   than something white in colour “ Is that true ?” he asked himself . He wanted to know the answer.
It happened to be a   52  day and there was snow on the ground. He put two large pieces of cloth over the snow . One piece was black in colour and the other was white . The sun shone (照耀)  53  the two pieces of cloth .Two hours later ,Franklin took off the cloth and found that the snow under the black cloth melted (融化) more  54  than the snow under the white cloth.
He was happy that he had learned  55   from his friend.
小题1:
A.eihgtB.nineC.tenD.eleven
小题2:
A.lessB.moreC.littleD.much
小题3:
A.startedB.will likeC.wantedD.liked
小题4:
A.seldomB.alwaysC.hardlyD.never
小题5:
A.classmatesB.brothersC.friendsD.teachers
小题6:
A.slowerB.woreC.betterD.longer
小题7:
A.bad B.fineC.cloudyD.rainy
小题8:
A.besideB.inC.onD.above
小题9:
A.easilyB.quietlyC.slowlyD.quickly
小题10:
A.all thingsB.everythingC.anythingD.something
题型:单项选择题
某交流电电源电压的瞬时值表达式为u=6sinl00πt(V),则下列说法中正确的是(  )

A.用交流电压表测该电源电压时,示数是6V

B.用交流电压表测该电源电压时,示数是6V

C.用此电源给电磁打点计时器供电时,打点的时间间隔为0.01s

D.把标有“6V 3W”的小灯泡接在该电源上时,小灯泡将被烧毁

题型:单项选择题

国家的主权、统一、领土完整和安全遭受的威胁消除后,应当按照决定实施《国防动员法》的规定解除国防动员的实施措施。

题型:单项选择题

不是多动症的儿童一般不会表现出()

A.精力过剩

B.动作灵活协调

C.常翻箱倒柜

D.常以跑代走

题型:单项选择题

发电机氢冷器定期放空气、排污的作用,各接引在氢冷器那个部位,排放周期?

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