简述循环流化床锅炉床面结焦时,床温、氧量、火焰的变化情况。
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除企业以外的全社会范围内的各种综合经济信息管理活动称为()
public class TestOne { public static void main (String[] args) throws Exception { Thread.sleep(3000); System.out.println(”sleep”); } } What is the result?()
A. Compilation fails.
B. An exception is thrown at runtime.
C. The code executes normally and prints “sleep”.
D. The code executes normally, but nothing is printed.
两船对遇采取转向避让,转舵时机最迟应在()。
A. 相距4倍船长以外
B. 相距两船长度之和以外
C. 相距三船横距之和以外
D. 相距两船纵距之和以外