单项选择题
" And as you set off from Wellesley, I hope that many of you will consider making three very special choices. The first is to believe in something larger than yourself, to get involved in some of the
未知题型 竣工备案验收表上的面积要将人防面积抠出来。因为这是非人防竣工备案，需剔除人防，而不是根据规划许可、施工许可面积来写（）
单项选择题 555定时器的引脚1为？
未知题型 牛腿的破坏形态主要取决于a/h0，有五种破坏形态，分别为弯压破坏、剪切破坏、斜压破坏、斜拉破坏和局压破坏。
