单项选择题
已知塔吊尺寸如图，已知P2=700kN,为使起重机满载（P1=200kN)时不至于翻倒，平衡载重P3最小时，塔...
单项选择题已知塔吊尺寸如图，已知P2=700kN,为使起重机满载（P1=200kN)时不至于翻倒，平衡载重P3最小时，塔吊是什么状态？ A、绕A点向左侧倾倒的临界状态 B、绕A点向右侧倾倒的临界状态 C、绕B点向左侧倾倒的临界状态 D、绕B点向右侧倾倒的临界状态
可以在BroadcastRrceiver和onReceiver方法中处理耗时复杂的业务
判断题可以在BroadcastRrceiver和onReceiver方法中处理耗时复杂的业务
If a positively charged particle is placed at point P, ...
单项选择题If a positively charged particle is placed at point P, the force due to the magnetic field ( ) A. increases with increasing charge B. is opposite the direction of the magnetic field C. is zero D. is in the direction of the magnetic field E. causes the particle to accelerate to the right
A.
increases with increasing charge
B.
is opposite the direction of the magnetic field
C.
is zero
D.
is in the direction of the magnetic field
E.
causes the particle to accelerate to the right