A:had the film been o
B:the film had started
C:the film had lasted
D:had the film ended
在实数 227,−5,π2,83,3.14 ,无理数有( )
下面关于超声波或超声波利用的说法中,不正确的是( )
A sense of ________ is _____ it takes for a comedian to perform well in a comedy.
一个正方体的展开图如图所示,将它折成正方体后,数字“0”的对面是( )