第3题
Sea turtles migrate across thousands of miles of ocean before returning to nest on the same stretch of coastline where they hatched, but how they do this has mystified scientists for more than fifty years. Sea turtles likely go to great lengths to find the places where they began life because successful nesting requires a combination of environmental features that are rare: soft sand, the right temperature, few predators, and an easily accessible beach. From this passage it is safe to conclude that sea turtles
A、are not easily observed by scientists.
B、cannot lay their eggs on any beach other than the one on which they hatched.
C、will not lay their eggs on beaches with pebbly sand.
D、must have the ability to precisely detect their location.
第5题
在海水中c(Cl-)≈10-5mol/L,c(I-)≈2.2′10-13mol/L,此时加入AgNO3试剂问()先沉淀,已知:Ksp(AgCl)=1.8′10-10,Ksp(AgI)=8.3′10-17
A. Cl-
B. I-
C. 同时沉淀
D. 不发生沉淀
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!