卷取机的用途为将带材带张力卷取，并与出口张力辊建立（）。

根据短文内容及首字母提示，填写所缺单词，使短文意思完整，每空只填一词。

Millions of American children attend summer camp. Traditional American summer camps offer young people a c_______小题1: to play many sports. These camps may be in the mountains. Or they may be in the woods, or at a lake. O_______小题2:  camps teach activities like painting or music. Or t________小题3:teach computer programming or foreign languages. Children at all kinds of camps m_________小题4: new friends. They learn new skills and develop independence (独立).

Some children go to camp d_______小题5: the day and return home at night. These places are c______小题6: day camps. Children as y_________小题7: as four years old attend day camps. Others stay at camp all day and all night. Most children w_________小题8: attend overnight camp are between the ages of about six and sixteen.

Children s________小题9: at an overnight camp for between one and eight weeks. P________小题10: can pay less than one-hundred dollars a week for an overnight camp. Or they can pay more than seven-hundred dollars a week.

关于仲裁协议，说法正确的是：（）

A.仲裁协议可以通过电子邮件的方式订立

B.仲裁协议仅约定纠纷适用的仲裁规则的，以制作该仲裁规则的仲裁委员会为确定的仲裁委员会，仲裁协议有效

C.仲裁协议未约定仲裁规则的，仲裁协议无效

D.以口头方式订立的仲裁协议有效

患儿7岁，7月15日因发热、嗜睡5天入院。体温40．0℃，浅昏迷，颈硬，双侧瞳孔小，膝反射亢进，巴氏征阳性，脑脊液无色透明，白细胞数95×10／L，多核细胞0．55，单核细胞0．45，葡萄糖3．0mmol／L，氯化物109mmol／L，蛋白0．6g／L，外周血白细胞14．5×10／L，中性粒细胞0．80，淋巴细胞0．20。最可能的诊断是（）

A.流行性乙型脑炎

B.虚性脑膜炎

C.中毒性痢疾

D.流行性脑脊髓膜炎

E.结核性脑膜炎

海色

设随机变量X的二阶矩存在，则（）。

A.A

B.B

C.C

D.D