如图所示,悬挂在O点的一根不可伸长的绝缘细线下端有一个带电量不变的小球A。在两次

题型:不定项选择

问题:

如图所示,悬挂在O点的一根不可伸长的绝缘细线下端有一个带电量不变的小球A。在两次实验中,均缓慢移动另一带同种电荷的小球B。当B到达悬点O的正下方并与A在同一水平线上,A处于受力平衡时,悬线偏离竖直方向的角度为θ,若两次实验中B的电量分别为q1和q2,θ分别为30°和45°。则q2/q1

[ ]

A.2

B.3

C.2

D.3

考点:库仑定律共点力的平衡
题型:不定项选择

在正方体ABCD-A1B1C1D1中,直线BC1与平面A1BD所成角的余弦值是______.

题型:不定项选择

— I am sorry for being late.

— _____[ ]

A. That's right.

B. You are welcome.

C. It doesn't matter.

D. You should be sorry.

题型:不定项选择

下列未达账项中,会导致银行存款对账单金额大于银行存款日记账金额的有( )。

A.企业已开出但银行尚未兑付的支票

B.企业已收但尚未存入银行的转账支票

C.银行收到委托款项但尚未通知企业

D.银行划付电话费但未将通知单送达企业

题型:不定项选择

Any combination of overwork and stress inevitably leads of insomnia. Managers at HiCorp, Inc., all suffer from stress. A majority of the managers—despite their doctors’ warnings—work well over 60 hours per week, whereas the other managers work no more than the normal 40 hours per week. HiCorp gives regular bonuses only to employees who work more than 40 hours per week.
Which of the following conclusions is most ply supported by the statements above

A.Managers at HiCorp work under conditions that are more stressful than the conditions under which managers at most other companies work.

B.Most of the employee bonuses given by HiCorp are given to managers.

C.At HiCorp, insomnia is more widespread among managers than among any other group of employees.

D.No manager at HiCorp who works only 40 hours per week suffers from overwork.

E.(E) Most of the managers at HiCorp who receive regular bonuses have insomnia.

题型:不定项选择

根据勘测站点的(),确定合理的天线类型,天线高度,水平波瓣宽度、方位角和下倾角。

A.位置

B.环境

C.位置和环境

D.其他

更多题库