欢迎来到牛牛题库网 牛牛题库官网
logo
搜索

多项选择题

中国海洋生态系统存在的问题？ A.
过度捕捞 B.
海洋环境污染 C.
海洋生境破坏 D.
过度的水产养殖 E.
海岸侵蚀

点击查看答案&解析

相关考题

单项选择题
Cats are creatures of habit.They like to go to sleep about the same time every day and for a certain length of time.They seem to have a natural clock inside them that tells them when to sleep.
Cats increase their regular sleep with occasional cat naps（打盹）.Some experts feel that humans could also benefit from this habit.Cat naps help to build up energy in the body.They are also a good way to get rid of trouble!Since cats have the same moods（情绪）as humans,some experts behave that people can improve their moods.People might become happier.
A number of famous people have copied cats by taking cat naps during the day.The naps would usually last from 15 to 30 minutes.
Winston Churchill took cat naps.So did Presidents Harry Truman,John F.Kennedy and Lyndon B.Johnson.These famous men were known for their energy.They were also able to work long hours,often into the night.Napping was their secret.
Perhaps more people learn from cats and take naps to feel better and live longer!
Naps usually last__________.
A.threehours
B.lessthanhalfanhour
C.forty-fiveminutes
D.fifty-fiveminutes
单项选择题
生产汽车的某企业最近向市场推出食品,这是通过( )寻找市场营销机会的方法。
A、产品开发
B、市场开发
C、市场渗透
D、多元化经营
单项选择题
《无障碍设计规范》对人行天桥、人行地道的扶手设计作了相应的规定，下列哪条表述不符合规范要求？( )
A.扶手高应为0.85～0.90m，设上、下两层扶手时下层扶手高应为0.65～0.70m
B.扶手应保持连贯，在起点和终点处应延伸0.40m
C.扶手下方为落空栏杆时，应设高不小于0.10m的安全挡台
D.人行地道的坡道和梯道入口两侧的护墙高于0.85m时，在墙顶应安装护栏或扶手
微信小程序免费搜题

All Rights Reserved 版权所有©牛牛题库网(nntiku.com)

备案号：湘ICP备2022003000号-1

微信扫一扫,加关注免费搜题

微信扫一扫,加关注免费搜题