肝脏显像欠佳的最常见原因是（） A.肋骨的反射 B.饮水后 C.结肠内的气体 D.呼

股票投资风格是基金经理人以股票的行为模式为基准确定基金投资类型的一种组合管理模式。（）

Today, we have Chinese _______ eight o’clock.

A. in           B. on         C. at

经济民俗主要包括( )等几个方面。

A．服饰

B．饮食

C．居住

D．岁时节日

(1) In the strength of the carrier signal is varied to represent binary 1 or 0.

(2) is a system that can map a name to an address and conversely an address to an name.

(3) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol

(4) is an approach that enables an ATM Switch to behave like a LAN switch.

(5) is an guided media which is made of glass or plastic and transmits signals in the form of light.

2（）

A．NAT

B．NCP

C．DDN

D．DNS

电力公开、公平、公正调度应当遵循的原则有哪些？