能在溶液中大量共存、且加入(NH4)2Fe(SO4)2·6H2O晶体后仍能大量存在的离子组是（   ）

2012年11月18日，欧盟高等法院终审判定奥康在抗辩欧盟反倾销的案件中胜诉，从而给这场持续达6年之久的官司画上了一个句号。这令频遭反倾销之困的出口企业信心为之提振。奥康的胜诉给我们的启示是

阅读下文，回答问题
                                                                                                  On the beach
    It is a fine day. A lot of people go to the beach to enjoy sunshine. Some people are swimming like fishes in the sea. On the beach，some young people are playing volleyball.
    Some of them are lying under the coconut trees. And some old people are chatting with each other. What are the children doing? Look! They are making castles with spade and sand. They are having fun。
⑴⑵⑶⑷⑸根据短文内容，判断正误；⑹根据短文内容填空。

下列有关细胞生命活动的叙述中，正确的是

如图所示，小球被轻质细绳系住斜吊着放在静止的光滑斜面上，设小球质量为m，斜面倾角α=30°，细绳与竖直方向夹角θ=30°，斜面体的质量M=3m，置于粗糙水平面上．求：