单项选择题When the rescue team arrived at the village, they only found houses left ________ after the earthquake.A) to destroyB) to be destroyedC) destroyingD) destroyed
单项选择题拧紧成组螺母时,为使被连接件及螺杆受力均匀一致,必须按一定顺序分次逐步拧紧,其一般原则为( )。 A. 从中间向两边对称地扩展 B. 从两边向中间对称地扩展 C. 从两边向中间对角线地扩展 D. 无要求