首页
登录
职称英语
As in the field of space travel, so in undersea exploration new technologies
As in the field of space travel, so in undersea exploration new technologies
游客
2024-12-04
14
管理
问题
As in the field of space travel, so in undersea exploration new technologies continue to appear. They share a number of similarities with each other--as well as some important differences.
Manned submersibles, like spaceships, must maintain living conditions in an unnatural environment. But while a spaceship must simply be sealed against the vacuum of space, a submersible must be able to bear extreme pressure if it is not to break up in the deep water.
In exploring space, unmanned vehicles were employed before astronauts. In undersea exploration, on the other hand, men paved the way, and only recently have unmanned re- mote-operated vehicles (ROVs) been put to use.
One reason for this is that communicating with vehicles in orbit is much easier than talking to those underwater. A vacuum is an ideal medium for radio communications, but underwater communications are limited to much slower sound waves. Thus, most undersea vehicles-particularly ROVs-operate at the end of long ropes.
For a similar reason, knowing where you are undersea is much more difficult than in space. A spaceship’s position can be located by following its radio signal, or by using telescopes and radar. For an undersea vehicle, however, a special network of sonar devices must be laid out in advance on the ocean floor in the area of a dive to locate the vehicle’s position.
Though undersea exploration is more challenging than outer space in a number of aspects, it has a distinct advantage, going to the ocean depths doesn’t require the power necessary to escape Earth’s gravity. Thus, it remains far less expensive. [br] Which of the following is NOT mentioned in the passage?
选项
A、New techniques are continually developed and new machines invented for undersea exploration.
B、If not well built, a submersible is most likely to get crushed in deep water.
C、A submersible, when manned, looks very like a spaceship.
D、In certain respects undersea exploration is often faced with the same problem as the space exploration.
答案
C
解析
“New techniques are continually developed and new machines invented for undersea exploration”,这在第一和第三段中提及过;“If not well built, a submersible is most likely to get crushed in deep water”,这在第二段最后一句话中提到过;“In certain respects undersea exploration is often faced with the same problem as the space exploration”,在第一段末提到过。尽管文章第二段提及“Manned submersibles, like spaceships, must maintain living conditions in an unnatural environment”,但不能将其理解为“A submersible, when manned, looks very like a spaceship”,可见选择项[C]在文中没有被提及,所以是正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3872541.html
相关试题推荐
Swiftinventedfamous______inhisworldfamousGulliver’sTravels.A、LilliputB
Asinthefieldofspacetravel,soinunderseaexplorationnewtechnologies
WhichofthefollowingisNOTFrancisBacon’sessay?A、OfStudies.B、OfTravel.C
Gulliver’sTravelswaswrittenbyA、DanielDefoe.B、CharlesDickens.C、JonathanS
Theexplorationofinternationalbusinessisanexciting,important,andne
Theexplorationofinternationalbusinessisanexciting,important,andne
Theexplorationofinternationalbusinessisanexciting,important,andne
Theexplorationofinternationalbusinessisanexciting,important,andne
Theexplorationofinternationalbusinessisanexciting,important,andne
Whichisthebestwordtodescribeairtravellers’reactiontoairlinealliances
随机试题
[originaltext]M:Hi.Mary.Howareyou?W:Fine,thanks.Howarethingsgoing?
[originaltext] InApril,2014,theFoodandDrugAdministration(FDA)issueda
按照工程造价构成划分,属于措施项目费的有()。A、工程定位复测费 B、环境保护
男性,19岁。右腹股沟部被刀刺伤30分钟,在当地医院加压包扎后急转院。查体:脉搏
患者男,50岁。突起呼吸困难,咳粉红色泡沫痰,血压190/100mmHg,诊为急
患者,女性,62岁。高血压病史10年,血压控制不良,本次因“高血压,脑出血”急诊
关于过碘酸一雪夫反应的染色反应叙述错误的是A.缺铁性贫血中幼红细胞呈阳性B.慢性
合同履行的跟踪策划的内容包括()。A、确定跟踪的对象B、确定收集信息的范围C
有三层楼板的影剧院,其建筑高度为20m,该建筑属于()。A.单层 B.多层
根据需要只对部分财产进行盘点和核对是指()。A、定期清查 B、局部清查 C、
最新回复
(
0
)