【简答题】计算: (1)(- )×(-1 )÷(-2 ); (2)-6÷(-0.25)× 。
【单选题】A residual magnetic field is always?
A.
Stronger than the magnetic field producing it
B.
Weaker than the magnetisiing field producing it
C.
Equal to the magnetising field producing it
【判断题】对于任意两个随机事件A、B,有P(A∪B)=P(A)+P(B)-P(AB)
【单选题】The diagram shows a straight wire carrying current i in a uniform magnetic field. The magnetic force on the wire is indicated by an arrow but the magnetic field is not shown. Of the following possibil...
A.
opposite the direction of the current
B.
in the direction of force.
【单选题】《礼记·哀公问》:“大婚为大,大婚至矣。大婚既至,冕而亲迎”,记载的是婚姻六礼中的( )。
【简答题】计算: 小题1:(1)(6分) ; 小题2:(2)(6分) .
【简答题】已知(1-2x) 6 =a 0 +a 1 x+a 2 x 2 +…+a 6 x 6 ,则|a 0 |+|a 1 |+|a 2 |+…+|a 6 |=( )。
【单选题】I can’t pretend ________ happy when I am not.
【单选题】–Were you at school when he came to see you? –Yes, I ______ a math class.