联产品的联合成本的分配主要有几种方法，说明它们的适用范围和优缺点。

阅读理解： 先阅读下列短文，掌握其大意，然后在A B C D四个答案中选出最佳答案。

       Leopards (豹) live in many parts of the world, from Siberia to Africa. They have a very beautiful yellow

skin with large black spots. They live for about 15 years and eat small mammals (哺乳动物) such as zebras,

monkeys, and antelopes (羚羊). They sleep for about 12 hours a day. Leopards are very solitary (独居的)

animals. They spend most of their time alone in trees, where they wait until a small animal passes. They jump on

the animal and then drag it up into the tree, where they eat it.

       Like many animals, leopards are disappearing because people hunt them. They kill them for their beautiful

coats. The Sinai leopard, for example, from Egypt, is now probably extinct (绝种的).

1. How old is a leopard? [ ]

A. Fifty weeks

B. Fifteen months

C. Twelve days

D. Fifteen years

2. Leopards live             . [ ]

A. live in family groups

B. live alone

C. live together

D. live with other animals

3. Leopards spend much time in tree because they want to             .[ ]

A. sleep

B. jump

C. wait and catch small mammals

D. rest

4. Which is not true? [ ]

A. Leopards have beautiful fur

B. Leopards eat animals and plants

C . Leopards sleep 12 hours a day

D. The Sinai leopard probably extinct

5. Why do people hunt leopards?   Because              .[ ]

A. they kill them for their meat

B. they attack people all the time

C. they are dangerous

D. they kill them for their coats

对运行中的保护装置及自动装置的外部接线进行改动，必须履行什么程序？

工程造林自查内容有哪几项？

城镇未预见水量Q_u和管网漏失量Q_r可按最高日用水量的( )合并计算。

A．15～20%
B．20%～30%
C．15%～25%
D．10%～20%