K-Chief 600系统中的系统网关（SGW）是用于扩展局部CAN总线的设备。

Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.

Very high waves are destructive when they strike the land. Fortunately, this seldom happens. One reason is that out at sea, waves moving in one direction almost always run into waves moving in a different direction. The two sets of waves tend to cancel each other out. Another reason is that water is shallower near the shore. As a wave gets closer to land, the shallow bottom helps reduce its strength.

But the power of waves striking the shore can still be very great. During a winter gale, waves sometimes strike the shore with the force of 6,000 pounds for each square foot. That means a wave, 25 feet high and 500 feet along its face, may strike the shore with a force of 75 million pounds.

Yet the waves, no matter how big or how violent, affect only the surface of the sea. During the most raging storms, the water a hundred fathoms(600 feet) beneath the surface is just as calm as on a day without a breath of wind.

According to the passage, destruction caused by high waves occurs ______.

A．regularly

B．rarely

C．always

D．predictably

By using MP3, a 600M-byte music CD can be(1)to 50M bytes or less. It can be streamed (downloaded in chunks) so that you can begin listening to the opening bars while the(2)of the life arrives in the background. And, most important, MP3 music files retain good listening(3)that(4)compression schemes lacked. That(5)of features makes accessing and distributing music on the Web practical for the frst time.

A、A Polyvinyl chloride

B、B Polyurethanes

C、C Polyesters

D、D PMMA

A、Epistasis

B、The inbreeding coefficient

C、Hybrid vigor

D、Environmental effects

E、Heritability

A、定值控制系统

B、随动控制系统

C、正弦函数控制系统

D、程序控制系统

A、Pt100热电阻传感器

B、镍铬一镍硅热电偶传感器

C、扩散硅压力传感器

D、红外探测仪

A、调节单元输出的控制信号

B、扰动信号

C、给定值与测量值的偏差信号

D、测量信号

A、开大冷却器通路的阀门开度，关小旁通通路的阀门开度

B、关小冷却器通路的阀门开度，开大旁通通路的阀门开度

C、开大冷却器通路的阀门开度，开大旁通通路的阀门开度

D、关小冷却器通路的阀门开度，关小旁通通路的阀门开度