直流系统解锁过程中一般（）。A.先解锁整流侧 B.先解锁逆变侧 C.同时解锁 D.都

统计的基本步骤是()

A．搜集资料、整理资料和分析资料

B．设计、搜集资料、整理资料和分析资料

C．搜集资料、计算均数、标准差、标准误

D．选择对象、计算统计指标、参数估计和假设检验

E．设计、统计分析、统计描述和统计推断

输尿管上狭窄是()

A．壁内部

B．肾盂下5cm处

C．与髂血管交叉处

D．骨盆出口

E．肾盂与输尿管移行处

EPC模式条件下业主招标文件的重要内容是( )。

A．业主要求
B．投标须知
C．评标方法
D．投标时间

转让无形资产的营业税税率为( )。

A．3%
B．5%
C．7%
D．5%～20%

B Egyptian Villages 埃及村落

Most of the inhabitants live in mud-brick homes, their (1)  walls insulating against the afternoon heat. Flat roofs, exposed (2)  the northern evening breezes, serve as cool sleeping (3)  as well as storage areas. Villagers plaster the outer walls (4)  often trim them in blue, a color they believe (5)  off the evil eye. As a man becomes richer, (6)  can add a second story to his house perhaps (7)  his married son. Those villagers who have made the (8)  to Mecca paint the legend of their trip on (9)  outer walls of their homes. Such hajj houses, along (10)  the mosques, are the most distinguished buildings in a (11)

Some villagers build ornate pigeon coops close to their (12) , using the birds as food and their droppings to (13)  crops. Many houses still have dirt floors and lack (14)  or running water; women with jars balanced on their (15)  make the trek to the community well, and children donkeys haul the (16)  liquid in jerry cans.

All (17)  said, government sponsored building programs have also brought newer (18)  residences and utilities to some villages, particularly those outside (19)  Nile Valley in the Oases and the Red Sea (20)  areas.

8.（）