con计算公式：（LFD1-LFD2）/2（）

A.5%σcon

B.10%σcon

C.15%σcon

D.20%σcon

A.wap. shou. con

B.www. sohu. com

C.wap. www. sohu. con

D.www. wap. sohu. com

A.GRQ

B.UDT

C.SNTM

D.CON

A.CON

B.NON

C.ACK

D.RST

It is known that solar power can ______ electric energy.

A．convert into

B．convert to

C．be converted into

D．be converted to

A. contact

B. contact to

C. touch

D. touch to

一个LTI系统，其h[n]=aⁿε[n]，-1＜a＜1。输入x[n]=con(2πn/N)，N=4，求系统响应。

The " mayhem " Joe Saltzman's mentioned refers to______.

A．responsibility

B．disorder and confusion

C．violent crime

D．embarrassment

A.ANN

B.ANC

C.ANM

D.CON

A．0.3fptk

B．0.4fptk

C．0．5fptk

D．0.6fptk

Jeffrey Sachs described the situation in Malawi in order to

A．give examples of the poor condition in Malawi.

B．criticize the $1 price of the drugs.

C．appeal to the audiences' symphathy.

D．show his sympathy to Malawian people.