题干

电控调光玻璃能根据光照强度自动调节玻璃的透明度.其原理是:光照增强,光敏电阻Rx阻值变小,施加于玻璃两端的电压降低,玻璃透明度下降,反之则玻璃透明度上升.若电源电压不变,R0是定值电阻,如图所示电路图中符合要求的是(   )

A:

B:  

C:

D:

上一题 下一题 0.0难度 选择题 更新时间:2019-03-02 12:04:09

答案(点此获取答案解析)

A

同类题1

阅读下面的文字,完成后面小题。

酥皮糖糕

文/张凯

    一绝巷紧靠淮河码头。因淮源人没有忘记王拐子门前那块“清宫御点”牌匾,楞是把酥皮糖糕当做一绝。

    就像天津卫的狗不理包子,云南的过桥米线一样,一绝巷的酥皮糖糕也是有历史典故的。若不,县志办的人也不会左三番右五次地来找王拐子,非要他在地方美食这一章节里,把酥皮糖糕的来龙去脉说个仔细不可。他做人也同他制作糖糕一样,斤是斤两是两,从不含糊。他清楚,虽说这“清宫御点”的牌匾挂在了自家门前,可王家并没有资格独享专利。

    光绪年间老佛爷慈禧路经这里时,为她做糖糕的是两个人而不是一个人。他们都早已作古,一个是王家的先人,另一个便是对门街坊仇俊发。为争这块匾额,两家人明争暗斗了几辈子。自从王拐子被爹打跛了腿,仇家人带着痴恋上王拐子的独生女儿远走他乡,这“清宫御点”牌匾才算稳稳当当地挂在了王家的门口。如今,挂着它招揽一下生意倒还可以,真要是白纸黑字地入书立志,王拐子自觉问心有愧。

    王拐子如果不说,这酥皮糖糕的故事怕真的就要失传了。晚清时节,这巷子口原本有两家糖糕铺子,做出的糖糕各有特色,难分伯仲。刚好那一年老佛爷巡游四方,船泊码头,她一时心血来潮要品尝一下民间小吃,王仇两家便遵旨把糖糕奉上龙船。那天老佛爷玩得高兴,胃口大开,把仇家的糖糕一口气吃了三个,连声称好,端上王家的糖糕时,不知为何她只咬了一口便放下了。自此,王仇两家糖糕孰高孰低算是被老佛爷的金口玉牙一咬定了音,“清宫御点”的牌匾此后便一直挂在仇家门口。

    王拐子自小就能体察到王家人对仇家人的敌视。他倒觉得仇家人蛮好,仇家的糖糕也蛮好吃的。尤其仇家妮子那双会说话的眼睛,常引得他伸着脖子往街对面望。她不明白,老爷子为什么会动那么大的肝火。那天,他只不过想给仇家妮子送一担荆山白乳泉里担回来的泉水,还没挑到仇家门口,竟被发了疯似的老爷子失手打残。人丁不旺的仇家无意再与王家对峙,一天夜里便搬出了家什人去屋空。

    残了腿的王拐子更是倔强,他一辈子没有结婚,他用这种独特的方式报复了只剩他一根独苗的老爷子。

    对面新开了一家糖糕店。店主是个中年汉子,姓卜,朝鲜族人。这店一开,王拐子的“清宫御点”便一日不济一日。这天趁顾客多的时候,王拐子也混进店里看了一眼,一看顿觉耳目一新。小店洁净温馨,雪白的桌布,锃亮的桌椅,墙壁上挂着些极富民族特色的小饰品。为糖糕佐餐的是口味极佳的朝鲜族咸菜、辣白菜、道拉吉……还有白白嫩嫩的豆腐脑。姓卜的店主认出了王拐子,热情地请他就坐,叫上糖糕小菜让王拐子品尝指点。王拐子本意是来刺探情报,这一来倒叫他愈加羞愧。店主说本来在延边生意做得挺红火的,可寡母年纪越老越怀旧,非要回到淮源开店不可……王拐子一震,刚咬了一口的糖糕掉在桌上。店主并未察觉,仍旧侃侃而谈。他说办这店全凭阿妈早年的手艺,只不过后来融进了打糕的做法,多了几道工序,口感就更没说的了。

    王拐子不知自己是怎么走出店门的。从此一绝巷的人们再也没有见到他做过糖糕。他家门上的那块“清宫御点”牌匾也不知何时摘掉了。

    这日,王拐子从城郊的荆山白乳泉里挑了一担泉水下来。此刻他才明白了老爷子当年为何下那狠手。用这泉水和面炸出来的糖糕格外酥软香甜,仇妮的手艺虽然无人能比,但细细品尝口味还能觉出水管子的铁腥气和自来水里的消毒剂味。王拐子一瘸一拐地挑担走过一绝巷,当要叩响卜家大门时,万千感慨涌心头。嘿,送这一担水,竟然足足走了半个世纪。

同类题2

任务型阅读

    Now, if you want to be charming, then you'll need to build self-confidence, but becoming more outgoing is actually pretty easy. To get to a point at which you feel comfortable talking to complete stranger, follow these steps.

    Encourage your curiosity about people____I wonder what his parents look like. I wonder what her favorite color is. Is he from around here? Is she the girl I saw at the movie theater last week? It will take some conscious effort, but you can't be outgoing if you don't care about people.

    Smile at others. Make it a goal to smile at one person a day. It can be anybody, and it can be the most subtle(微妙的) of smile. A quick glance paired with a smile---then run away if you want!____Eventually, you will want to get to a point where you smile instinctively whenever you make first eye contact with someone.

    Ask people questions. The standard ”how are you?” doesn't really count, because people use it as a greeting rather than a real question____This is where the curiosity and interest in others come into play.

    ____This is key to being a good conversationalist. If you don't make enough eye contact, the other person will feel invisible and the sense that you're elsewhere mentally. If you make too much, they'll feel uncomfortable. Is that specific enough for you?

    Note your body language____To show that you're outgoing and welcome conversations, keep your body open, you head up, and a smile on your face. Resist playing with your phone or otherwise occupying yourself.

A. Master eye contact.

B. Never hesitate to smile at others.

C. Most of communication isn't verbal.

D. The more you do it, though, the less scary it will be.

E. Make eye contact when you're asking questions about people.

F. Wherever you go, try to observe people, and ask questions about them.

G. If you've already exchanged eye contact and smiles with someone, start off with a question,