在网络预约出租汽车运营过程中,网络预约出租汽车驾驶员应携带《网络预约出租汽车运输证》和()。
A. 网络预约出租汽车驾驶员证
B. 居住证
C. 身份证
D. 驾驶证
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public class A extends Thread { A() { setDaemon(true); } public void run() { (new B()).start(); try { Thread.sleep(60000); } catch (InterruptedException x) {} System.out.println(“A done”); } class B extends Thread { public void run() { try { Thread.sleep(60000); } catch (InterruptedException x) {} System.out.println(“B done”); } } public static void main(String[] args) { (new A()).start(); } } What is the result?()
A done
B done
C. A done B done
D. B done A done
E. There is no exception that the application will print anything.
F. The application outputs “A done” and “B done”, in no guaranteed order.
雷达控制图是某天气雷达的控制和伺服机柜的框图。220VAC50Hz电源加在开关S1的输入端。当S1闭合时交流电会加到哪些部位?当K1受到RCP的激励吸合,交流电又会加到哪里?
施工升降机在正常工作状态下,下极限开关挡板的安装位置应保证吊笼碰到缓冲器之前,下极限开关应首先动作。()
A. 正确
B. 错误