【多选题】网络短视频平台应当履行版权保护责任,不得未经授权自行 、 电影、电视剧、网络电影、网络剧等各类广播电视视听作品
【多选题】触电危险辨识中,下列哪几项属于人的不安全行为:( )
【单选题】生物反馈治疗常用的生理信号不包括( )。
【单选题】Suppose that when ABC produces 1 new drama series in a season it gives up the chance to produce 3 new reality shows. This means that _________.
A.
the opportunity cost of a new drama series is 1/3 of a new reality show
B.
the opportunity cost of a 1 new reality show is 1/3 of a new drama series
C.
CBC has a comparative advantage in producing new drama series
D.
CBC has a comparative advantage in producing new reality shows
【单选题】下列计算正确的是 [ ]
B.
(2ab 2 )·(3ab)=-a 2 b 3
C.
(mn) 2 ·(-m 2 n)=-m 3 n 3
D.
-3x 2 y·(-3xy)=9x 3 y 2
【单选题】下列运算正确的是 [ ]
B.
(-3x 2 y) 3 =-9x 6 y 3
C.
4x 3 y 2 ·(- xy 2 )=-2x 4 y 4
【判断题】有些工作我根本安排不过来,只能临时挤时间去做。