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如图所示的电路中，当合上开关后，发现两个小灯泡L1和L2都不亮,用电压表测得UAC=UBD=6V．如果各段导线与接线处都无问题，则表明（??）
A
B
灯泡L1的灯丝断了
C
灯泡L2的灯丝断了
D
可变电阻器的电阻丝断了
E
开关未接通
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试题答案：
B
答案解释：
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2，2，5-三甲基-4，5-二乙基辛烷的结构简式为__________。
如图所示，有一个电阻不计的光滑导体框架，水平放置在磁感应强度为B，方向竖直向上的匀强磁场中，框架宽为L，框架上放一质量为m，电阻为R的导体棒ab，现用一水平恒力F作用于棒上，使棒由静止开始运动，棒的加速度最大值是__________，速度最大值是 __________。
有a．b、c、d四种金属，将a和b用导线连接起来，浸入电解质溶液中，b不易腐蚀；将a、d分别投入等浓度的盐酸中，d比a反应剧烈；将铜浸入b的盐溶液里，无明显变化；将铜浸入c的盐溶液里，有金属c析出。据此可推知它们的活动性由强到弱的顺序为（??）
A和B是前三周期的元素，它们的离子A2+和B3+具有相同的核外电子层结构，下列说法正确的是（??）
一列横波在z轴上传播，波速为20 m／s，在t=0时刻波的图像如图所示，已知质点B将比质点A先回到平衡位置，则（??）
在正方形的四个顶点上分别放置四个电性相同的点电荷，则正方形中心点0处（??）
将30 mL 0．5 mol／L NaCl溶液加水稀释到500 mL，稀释后溶液中NaCl的物质的量浓度为（ ）
已知某电场中的电场线如图所示，将一负电荷放在电场中的A点，它所受的电场力是FA，电势能是EA；将此电荷放在B点，它所受的电场力是FB，电势能是EB．则FA和FB、EA和EB的关系是（??）
如图所示，在坐标原点0处放置一电荷量为q1=1．6×10-9C的正电荷，在x1=4m处的P点的电场强度大小E1=0．9 V／m；今在x2=2m处再放置第二个点电荷q2，测得P处总的电场强度大小E2=1．8 V／m，方向沿x轴负方向，则（??）
向硫酸铝溶液中加入氨水，其反应的离子方程式为__________。
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1.
39．变文?
2.
37.破产债权
3.
(I)、 When someone gives you a present, it is very (1)______ to neglect to thank him for it. If it is given to you personally, you may thank him right away, though a note of thanks or a(n) (2)______ reference to the gift in a later letter always gives pleasure. If the gift is sent to you, you should write a letter of (3)______ at once. Try to thank of the things you like about the gift mention (4)______ in the letter.Polite (5)______ in China demthat a person stup when anyone enters a room or when anyone hands him something. In the West people do not stup nearly so frequently. When you are (6)______ a cup of tea or something to eat, for example, it is not correct to rise or even to make a slight rising movement. Remain seated receive it with a slight (7)______ of the head a smile say, "Thank you."If you are a man you must rise (8)______ feet when a lady comes up but not otherwise. A lady rises only when she is (9)______ to the host or to the guest of honor, or to a considerably older woman, not otherwise.In China we use two hands when giving something to a person, or when receiving it, if we want to be very (10)______.1.A. polite B. thoughtful C. impolite D. attentive
4.
It is exciting to apply for a job that rally appeals to you. In making your pplication, there are a number of points for you to observe.In your ltter of application, say just cnough to give a good account of yourself without being wondy. If you are answering an advertisement, any information for which it asks must, of course, be given. This will usually cover your academic recond and any further education and training. You may also be asked to give the namcs of one or two persons to supply references. For this purpose you should choose people who know you well cnough to vouch (保证) for your Character and ability, and to be polite, you should seck in advance their permission to be named as referees.h will depend on circumstancs how much you can care flly add about yourself. Your purpose is to bring to0 thenotice of the employer any good reason why you rather than any of the other pplicants should be choscn for the job.Therefore, if you feel you have any special skill or talent for the wok, or particubr interes in the line of busines, let it be known.Finall, there is your use of language. You cannot go wrong if you keep your scntences and pagaphs short,making sure the sense is clear and wl-xpressed. Choose plain words s0 long as they convey the meaning
5.
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