下列说法中正确的是 [ ] A.手提水桶感觉很累,原因是手受到水桶对它的重力作用

题型:选择题

问题:

下列说法中正确的是 [ ]

A.手提水桶感觉很累,原因是手受到水桶对它的重力作用

B.鸡蛋砸石头,鸡蛋碎了,原因是鸡蛋受到的力大

C.推出去的铅球,可以在空中飞行,原因是铅球始终受到推力的作用

D.在草地上滚动的足球,最终会停下来,原因是足球受到了摩擦力

考点:力的作用效果
题型:选择题

患者,女,26岁,已婚。孕8周, * * 出血量多,伴阵发性腹痛,诊断为难免流产。应首先考虑的治疗措施是

A.尽快清宫

B.卧床休息

C.肌注抗生素

D.给予止血药物

E.给予大剂量雌激素

题型:选择题

影响活塞环张力的是活塞环的()。

A.径向厚度

B.直径

C.搭口间隙

D.环槽间隙

题型:选择题
One day, I was working alone on the roof of a new six-story building. When I completed my work, I discovered that I had about 500 pounds of bircks left over!   36 carry the bricks down by hand I decided to lower them by a pulley(滑车), which fortunately was  _37 to the side of the building on the sixth floor.
Fastening the rope at the ground level, I went up to the roof and  _38 the bricks into a barrel (桶). Then I went back to the  _39 and untied the rope,   40 it tightly to insure a __41__  fall of the 500 punds of bricks. You know, I only weighed 135 pounds. Due to my __42 _ at being pulled off the ground so suddenly, I lost my presence of mind and  _43  to let go of the rope. Needless to say, I went on at a rather  _44 _ rate up the building.
Near the third floor, I met the barrel __45 , which made my collarbone(锁骨)broken, __46 _ only slightly, I didn’t stop. At approximately(大约)the same time, the barrel  _47__ the ground, and the bottom fell out of the barrel.   48 the bricks, the barrel now weighed about 50 pounds. I refer you again to my weight of 135 pounds.  _49   you might imagine, I began a rapid down.
Also near the  _50 _ floor, I met the barrel coming up, which made my legs broken. The encounter(相遇)with the _ 51 _ slowed me enough to reduce my  _52 when I fell onto the pile of bricks, and  53 , only three vertebrae(椎骨)were broken. However, as I __54__there on the bricks in pain, unable to move, and  _55  the barrel six stories above, I again lost my presence of mind. I let go of the rope!
小题1:
A.Rather than B.Other thanC.Better thanD.Instead of
小题2:
A.connectedB.attached C.addedD.joined
小题3:
A.broughtB.carriedC.loadedD.took
小题4:
A.ceilingB.floor C.roofD.ground
小题5:
A.grabbingB.pulling C.fasteningD.holding
小题6:
A.suddenB.quick C.slowD.peaceful
小题7:
A.carelessnessB.surpriseC.excitementD.joy
小题8:
A.forgotB.had C.tookD.began
小题9:
A.slowB.rapid C.strangeD.special
小题10:
A.coming downB.going upC.going downD.coming up
小题11:
A.SlowedB.Calmed C.RelaxedD.Cooled
小题12:
A.fellB.beat C.hitD.knocked
小题13:
A.BesidesB.WithoutC.WithD.Beyond
小题14:
A.AsB.When C.WhileD.Which
小题15:
A.firstB.ground C.secondD.third
小题16:
A.bricksB.barrel C.pulleyD.rope
小题17:
A.painB.weight C.injuriesD.speed
小题18:
A.unluckilyB.surelyC.undoubtedlyD.fortunately
小题19:
A.satB.lay C.stoodD.bent
小题20:
A.noticedB.rememberedC.watchedD.saw
题型:选择题

正常后前位胸片上,左心缘见不到()

A.主动脉结

B.肺动脉段

C.右心室

D.左心耳

E.左心室

题型:选择题

体外受精,体内发育,受精卵在口中孵化的鱼类是()

A.罗非鱼

B.虎鲨

C.星鲨

D.鲫鱼

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