首页
登录
职称英语
Someday, in【C1】______ the outer planets of our solar system, humankind wil
Someday, in【C1】______ the outer planets of our solar system, humankind wil
游客
2023-08-30
30
管理
问题
Someday, in【C1】______ the outer planets of our solar system, humankind will want to do【C2】______ send small probes that merely fly rapidly by them. In time, we will want【C3】______ spacecraft that will go【C4】______ orbit around these alien planets, land robots on their moons, and even return rock and soil sample back to Earth.【C5】______ , we will want to send humans to their moons, on at least【C6】______ which liquid water—the fundamental requirementfor life【C7】______ we know it—is believed to be【C8】______ .
For missions such as these, we will need rockets powered by a nuclear reaction【C9】______ igniting chemicals. Chemical rockets have served us well. But the【C10】______ low amount of energy that they can deliver for a given mass of fuel is a severe【C11】______ when dispatching spacecraft【C12】______ long distances. To reach the outer planets, for example, a chemically-powered space vehicle must【C13】______ fuel by having a very small mass and making【C14】______ use of gravity "assists", in which the craft maneuvers close enough to a planet for the planet’s gravity to propel the craft forward,【C15】______ its speed.
In technical term, chemical rockets have low【C16】______ velocity growth, which means that their exhaust velocities are not high enough to【C17】______ very high speed to the rocket. Nuclear rockets,【C18】______ their chemical counterparts, could impart a maximum velocity of【C19】______ about 22 kilometers a second. Such a high velocity would make possible a direct path to Saturn (土星), reducing travel time from about seven years to as【C20】______ as three. [br] 【C3】
选项
A、transport
B、dispatch
C、discharge
D、transmit
答案
B
解析
动词辨义题。本处意思是:我们会把飞船送进这些陌生行星的环绕轨道。故选B dispatch“发送”。
转载请注明原文地址:https://tihaiku.com/zcyy/2969320.html
相关试题推荐
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
Itisnotthe"somedayIwillwinthelottery"kindofdaydream,butthekin
随机试题
Childrenmodelthemselveslargelyontheirparents.Theydosomainlythroug
Itisallverywelltoblametrafficjams,thecostofpetrolandthequick
[originaltext]We’vebeenlookingatfearfrombiologicalperspective.Andso
大多数国家的高等学校分为下列哪几个层次()A.初级学院和短期大学、大学和专门学
A.泻火凉血 B.清胃火止呕 C.泻肝胆实火 D.清相火,退虚热 E.清
最常见的输血反应是()A.发热 B.荨麻疹 C.过敏性反应 D.溶血
根据《城乡医疗救助基金管理办法》,关于城乡医疗救助基金使用的说法,正确的是()。
关于建构主义方法论的基本观点,下列说法错误的是()。A.否认存在客观事实 B
B家具木材厂加工车间内用可移动式传送带传送物料。可移动式传送带的驱动电机使用38
某十万t级海港码头,采用重力式沉箱结构,沉箱外形尺寸如图1、图2所示,沉箱被隔墙
最新回复
(
0
)