右图是“探究平面镜成像特点”的情景：竖立的透明玻璃板下方放一_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

右图是“探究平面镜成像特点”的情景：竖立的透明玻璃板下方放一把直尺，直尺与玻璃板垂直；两支相同的蜡烛A、B竖立于玻璃板两侧的直尺上，以A蜡烛为成像物体．

选用直尺的作用是便于比较（）.

答案

参考答案：物距与像距的关系

完形填空

The family had just moved．The young woman was feeling a little        ．It was Mother's Day—and 800 miles separated her from her parents．
She had called them that morning，and her mother had        how colorful their backyard was        spring had arrived．Later，she told her husband how she        those lilacs(丁香)in her parents’yard．“I know where we can find some，”he said．“Get the        and come on．”So off they went．
Some time later，they stopped at a hill and there were lilacs all round．The young woman rushed up to the nearest        and buried her face in the flowers．Carefully，she       some．Finally，they returned to their car for the        home．The woman sat smiling，surrounded by her        ．
When they were near home，she shouted“stop”，got off quickly and        to a nearby nursing home．She went to the end of the porch(门廊)，where a(n)        patient was sitting in her wheelchair，and put the flowers into her lap．The two        ，bursting into laughter now and then．Later the young woman turned and ran back to her        ．As the car pulled away，the woman in the wheelchair        with a smile，and held the lilacs        ．
“Mom，”the kids asked，“        did you give her our flowers?”“It is Mother's Day，and she seems so        while I have all of you．And anyone would be        by flowers．”
This satisfied the kids，but not the husband．The next day he        some young lilacs around their yard．
I was the husband．Now，every May，our yard is full of lilacs．Every Mother’s Day our kids        purple lilacs．And every year I remember that smile of the lonely old woman．

C．disappointed

多项选择题

改性沥青混合料应随拌随用，贮存时间不得超过（）h，贮存期间温降不得超过（）℃，且结合料不得老化、滴漏及粗细料离析。否则应废弃。

A.24

B.48

C.10

D.20