单项选择题

高斯模式适用于地形平坦开阔、均一流场中排放量不稳定的固定污染源。( ) A. 对 B. 错

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单项选择题

Management reserve is used for——管理储备是用于 A.
Risks that are identified at the outset of the project项目开始时被识别的风险 B.
Risks that are not identified at the outset of the project but are known before they occur项目开始时未被识别,但在发生前被识别的风险 C.
Risks that cannot be known before they occur because they are external risks在发生前不可能知道的外部风险 D.
Any risks that cannot be known before they occur任何在发生前不可能知道的风险

单项选择题

广济桥上部结构不包含以下哪种桥梁形式（）
A、梁桥
B、拱桥
C、索桥
D、浮桥