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A.What do the three lines refer to？()
B.Power cord
C.Tail fiber
D.AC line
E.Signal cable
答案
更多“Cable laying on the cabling rack should be carried out following the rule of three lin”相关的问题
第1题
This passage is mainly about ________.
A) the beginnings of oceanography
B) the laying of the first undersea cable
C) the investigation of ocean depths
D) the early intercontinental communications
第2题
Certainly Newton considered some theoretical aspects of it in his writings, but he was reluctant to go to sea to further his work.
For most people the sea was remote, and with the exception of early intercontinental travelers or others who earned a living from the sea, there was little reason to ask many questions about it, let alone to ask what lay beneath the surface. The first time that the question "what is at the bottom of the oceans？" Had to be answered with any commercial consequence was when the laying of a telegraph cable from Europe to America was proposed. The engineers had to know the depth profile of the route to estimate the length of cable that had to be manufactured.
It was to Maury of the US Navy that the Atlantic Telegraph Company turned, in 1853, for information on this matter. In the 1840s, Maury had been responsible for encouraging voyages during which soundings were taken to investigate the depths of the North Atlantic and Pacific Oceans. Later, some of his findings aroused much popular interest in his book The Physical Geography of the Sea.
The cable was laid, but not until 1866 was the connection made permanent and reliable. At the early attempts, the cable failed and when it was taken out for repairs it was found to be covered in living growths, a fact which defied contemporary scientific opinion that there was no life in the deeper parts of the sea.
Within a few years oceanography was under way. In 1872 Thomson led a scientific expedition, which lasted four years and brought home thousands of samples from the sea.
Their classification and analysis occupied scientists for years and led to a fivevolume report, the last volume being published in 1895.
The proposal to lay a telegraph cable from Europe to America made oceanographic studies take on ______.
A．an academic aspect
B．a military aspect
C．a business aspect
D．an international aspect
第3题
A.lying out
B.laying to
C.arranging for
D.laying out
第6题
Laying claim to DNA stretches can be careless genetics because ______ .
A．those who patent gene fragments are not qualified geneticists
B．the same gene fragments are often patented by different scientists
C．geneticists have no idea what they are going to do with patented genes
D．some of the gene fragments patented contain no real genetic information
第7题
A.Insects chewing on its leaves．
B.Bees laying eggs on its leaves．
C.Pesticides sprayed on its leaves．
D.Knives cutting its stalk．
第8题
第9题
A．They have very few hairs on their bodies.
B．They bear their young rather than laying eggs.
C．Their lungs are full of hot air and water.
D．They can walk on their hind legs on land.
第10题
A．show respect when laying off the employee
B．restrain the employee's behaviours
C．order the security to drive the employee away
D．threaten to take the employee to court
