【判断题】个体就是一个人持久稳定的与众不同的特征。()
【单选题】A vessel engaged in minesweeping on the high seas carries which of the following day signals ?
A.
Two green balls in a vertical line
B.
Two black balls in a vertical line
C.
A black ball at the foretruck and yardarm ends
D.
A shape of two cones point to point
【单选题】The door and the windows were all closed and there was no _____ of forced entry. [ ]
【单选题】Scientists are sure that the color red ______.
A.
encourages athletes wearing it
C.
is superior to the color blue
D.
delivers messages of mental advantage TEXT C
【简答题】在图示的电路中,已知 C =0.1mF 。 开关 S 闭合后电路的时间常数 为( )s。