义务兵从被批准退出现役之日起，必须在多少天内到安置地的退伍军人安置机构报到？

阅读短文并判断正(√)误(×)。

      This is a picture of a small zoo. In the picture, you can see some animals. A monkey is running. A horse

is standing in front of the elephant. A calf is playing with his mother. There are five sheep over there. A goat

is eating with her five children. A foal and a lamb are talking. They are all friends. They are happy.

( ) 1. Some animals are in the small zoo.

( ) 2. An elephant is behind a horse.

( ) 3. A cow and her child are playing.

( ) 4. They are good friends, aren't they?

( ) 5. A baby horse and a baby sheep are talking.

选择坡口的原则，不应取决于______。

A．母材厚度

B．焊接方法

C．工艺要求

D．钢的强度

变压器过负荷，（）措施是无效的。

A.投入备用变压器

B.转移负荷

C.改变系统接线方式

D.调整变压器分接头

商务代理纠纷发生后，大多都是通过（）解决的。

A．私了

B．仲裁机关

C．协商和解

D．法院起诉

缺氧的概念是指

A．吸入气氧含量减少
B．血液中氧分压降低
C．血液中氧含量降低
D．血液中氧饱和度降低
E．组织供氧不足或利用氧障碍