如图所示,在以0点为圆心、半径为R的圆中,AC、BD为互相垂直的两条直径.电荷量

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问题:

如图所示,在以0点为圆心、半径为R的圆中,AC、BD为互相垂直的两条直径.电荷量均为Q的正、负点电荷放在圆周上,它们的位置关于AC对称,+Q与O点的连线和OC夹角为30°.下列说法正确的是(  )

A.O点的场强大小为

kQ
R2
,方向由O指向D

B.O点的场强大小为

3
kQ
R2
,方向由O指向A

C.A点的电势低于C点的电势

D.电荷量为q的正电荷在B点的电势能大于在D点的电势能

考点:电势差与电场强度的关系
题型:多选题

肾窦超声表现为一片状椭圆形的高回声区,其解剖基础为()。

A.肾盂、肾盏、肾血管、脂肪组织

B.肾周脂肪

C.肾实质

D.肾皮质

E.肾髓质

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用来存储当前正在运行的应用程序和其相应数据的存储器是______。

A.ROM

B.硬盘

C.RAM

D.CD-ROM

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根据《关于调整水资源费标准的通知》(浙价费[2004]209号)规定,水力发电用水按()元/立方米征收。

A.0.01

B.0.02

C.0.08

D.0.1

题型:多选题

Beyond question, Clinton was supposed to close up, stay out of sight, and avoid second- guessing his wife’s boss. After his ego blustered into oncoming traffic during Hillary’s heated primary race (1) Obama, the nation suffered from yet another turn of Clinton fatigue.

(2) this week Bill Clinton showed an instinct for robust, inclusive leadership that the (3) White House occupant could make good use of right for the time being. With President Obama struggling to (4) the political damage from the Gulf oil spill, Clinton not only can’t help himself—he’s worth being listened.

The conventional-wisdom (5) on President Obama’s early reaction to the spill was (6) he didn’t emote enough. He didn’t feel the (7) of all those people in the crisis whose livelihood would be destroyed, whose clean waters and wildlife would be (8) in black gunk.

Clinton considers this is an unfair (9) but offers a different—and more pointed— lesson to his young successor. "I think we ought to (10) in the same boat for a while... Let’s just (11) the problem, and then we can hold everybody responsible and emote or not emote, " Clinton conversed (12) CNN Anchor Wolf Blitzer.

Obama’s first (13) after the oil spill was to "feel the blame" rather than "feel the pain, " which are pretty sarcastic words as it were. No one intends to let British Petroleum (BP) management (14) the hook—for dangerously cutting corners, and for a (15) safety record. However, the President’s (16) focus on scolding BP consumed (17) White House energy while the oil gushed.

Great leaders don’t rush to criticise; Instead they instinctively (18) solutions. Rudy Giuliani, who didn’t stop to blame (19) intelligence for letting it happen, stood out from New York mayor with a girlfriend problem to 9/11 hero when he took control of a crisis and instilled confidence that a ravaged city could (20) beyond a terrorist attack.

7()

A.pressure

B.pain

C.shock

D.fear

题型:多选题

飞机上共有几个RMP()

A.1个

B.2个

C.3个

D.4个

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