电梯的顶部挂一个弹簧秤,秤下端挂了一个重物,电梯匀速直线运动时,弹簧秤的示数为1

题型:选择题

问题:

电梯的顶部挂一个弹簧秤,秤下端挂了一个重物,电梯匀速直线运动时,弹簧秤的示数为10N,在某时刻电梯中的人观察到弹簧秤的示数变为8N,关于电梯的运动(如图所示),以下说法正确的是(g取10m/s2)(   )

A.电梯可能向上加速运动,加速度大小为4m/s2

B.电梯可能向下加速运动,加速度大小为4m/s2

C.电梯可能向上减速运动,加速度大小为2m/s2

D.电梯可能向下减速运动,加速度大小为2m/s2

考点:失重
题型:选择题

The director had her assistant _____ some hot dogs for the meeting.[ ]

A. picked up

B. picks up

C. pick up

D. picking up

题型:选择题

制作临时装片时,必须让盖玻片的一边先接触载玻片上的水滴,然后再缓缓地盖上,其主要目的是

A.避免盖玻片下面出现气泡

B.防止水分过度溢出

C.增强装片的透明度

D.防止实验材料移动

题型:选择题

短文改错(共10小题;每小题1分,满分10分)

以下标有题号的每一行均有一个错误,请找出,并按下列情况改正:

此行多一个词:把多余的词用斜线(\\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

此行错一个词:在错的词下画一横线,在该行右边横线上写出改正后的词。

注意:请在答题卡上作答。

Last weekend we went mountain-climbing.Even the

heavy rain in the morning could not prevent us go.Setting                              76._______

off very early,we went along an extreme narrow road,all                               77._______

in high spirits.On every side of the road were green fields                              78._______

and some farm house.We could hear the sound of the                                           79._______

rain and our footsteps mixing with our laughter.At noon                                80._______

we reached the top of the mountain.That surprised us                                     81._______

most there was the beauty of scenes.After having a short                                82._______

rest there and sharing with the food we had brought.We                                 83._______

started going down.It had rained even harder.We were                                          84._______

wet to the skin,and we still sang and laughed happily.                                    85._______

题型:选择题

The problem is my weight. I’m just 1.57 meters high, but51. ______
my weight is 75 kilos. Many students often make a fun 52. ______
of me. Some boys were unfriendly for me—they call 53. ______
me "meat ball". That makes me to feel unhappy. 54. ______
Although I’m a bit too fat, yet I feel very well. I 55. ______
enjoy my meal. I love eating meat very much. And I like 56. ______
sweet food, though. I often have sugar with tea, milk. In57. ______
the past two months I had put on 5 kilos. So I’m becoming58. ______
more and more worried this problem, but I don’t 59. ______
know to lose weight quickly. Could you help me, dear doctor. 60. ______

题型:选择题

下列哪项属于虚哮证的临床表现()

A.口唇、爪甲青紫

B.喉中哮鸣如鼾

C.声低、咯痰无力

D.气短息促、动则喘甚

E.舌红苔黄腻、脉滑数

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