这是国家的经济水平决定的。
堤坝不是。设计时就要考虑到极端情况。大风大雨并不应该例外。
WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.
Copyright ©1998-2025 wenxuecity.com All rights reserved. Privacy Statement & Terms of Use & User Privacy Protection Policy