【单选题】Tom the party as no one saw him there yesterday evening.
D.
couldn ’ t have attended
【判断题】电泳可以分为自由电泳、区带电泳和毛细管电泳。
【单选题】单相全波可控制整流电路,若要减小输出平均电压,则控制角α应该( )。
【多选题】Which of the following statements correctly capture why an application that uses a Handler, might send Messages to the Handler, rather than post Runnables to it, or vice versa?
A.
Messages are used when the Handler implements the Message response.
B.
Runnables are used when the Sender implements the action to be taken.
C.
Messages can take parameters. Runnables can't.
D.
Runnables are less efficient than messages.
【单选题】单相全波可控制整流电路,若要减小输出平均电压,则控制角 α应该( )