下面这个程序段的时间复杂度是()。 for (i=1; i<n; i++) { y=y+1; for (j=0;j<=(2*n);j++) X++; }
A. O(log2n)
B. O(n)
C. 0(nlog2n)
D. O(n2)
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下列()属于监理单位投资控制的技术措施。
A. 完善职责分工及有关制度,落实投资控制的责任
B. 正确处理索赔事宜
C. 协助业主确定对目标控制有利的建设工程组织管理模式
D. 在施工阶段,通过审核施工组织设计和施工方案,使组织施工合理化
听力原文: Russia: At least nine people were injured when a small bomb exploded at a busy underground train station at Moscow. The Emergency Situations Ministry says two of the nine are children. Officials say they suffered mostly burns that are not serious. Officials are still searching for the people who placed the bomb. Moscow Mayor Yuri Luskov blamed terrorists.
At least nine people were injured when ______.
A. a car bomb exploded in Moscow
B. two trains collided at a train station
C. a bomb exploded in Moscow
D. an airplane crashed in Moscow
国家公务员一经录用,便不得被免职、降职和辞退。 ()
A. 正确
B. 错误