“克隆”、“转基因”等生命科学的重大突破，表明（ ） A．意识可以创造物质 B．

You need to listen to English songs______you can improve your listening skills .         [ ]

A. so                           

B. that                        

C.so that

水压机主体管道安装包括（）。

A．设备本体至第一法兰以内的高低压水管、压缩空气管的安装

B．高低压水管、压缩空气管的试压、刷漆，高压阀门试压

C．高压管道的焊口预热及应力消除，高低压管道酸洗

D．公称直径70mm以上管道的煨弯

在日常巡检中，清洁开关电源时可以用湿布进行清洁，但湿布必须拧干。（）

A typical application of this (71) is ADSL. It is emerging as the technology for home-and small-office Internet connectivity. It provides either 1.5 Mb/s～8 Mb/s from the network to the user and 64 Kb/s～512 Kb/s in the reverse direction depending on the distance, 12 000 or 18 000 feet.. The different speed for each direction gives it the (72) label. ADSL is designed to take advantage of the fact that video-on demand, telecommuting, and Internet access traffic are inherently asymmetrical. The user (73) a brief message up to the network and receives a ton of data coming back, either a movie or a piece of data download. Under such a scenario, low-speed traffic to the network is just fine. ADSL delivers high (74) where you need it and only uses a single copper pair. Through multiplexing, it also reserves (75) of the bandwidth for POTS.

A．channel

B．computation

C．speed

D．bandwidth