In Trial 9, the electrical force exerted by Sphere Y on Sphere X and the electrical force exerted by Sphere X on Sphere Y were exerted in which direction(s)?A.east； eastB.east； westC.west； westD.west； east

Text 2 To understand how astrology works, we should first take a quick look at the sky. Although the stars are at enormous distances, they do indeed give the impression of being affixed to the inner surface of a great hollow sphere surrounding the earth. Ancient people, in fact, literally believed in the existence of such a celestial sphere. As the earth spins on its axis, the celestial sphere appears to turn about us each day, pivoting at points on a line with the earth's axis of rotation. This daily turning of the sphere carries the stars around the sky, causing most of them to rise and set, but they, and constellations they define, maintains fixed patterns on the sphere, just as the continent of Australian maintains its shape on a spinning globe of the earth. Thus the stars were called fixed stars.

The motion of the sun along the ecliptic is, of course, merely a reflection of the revolution of the earth around the sun, but the ancients believed the earth was fixed and the sun had an independent motion of its own, eastward among the stars. The glare of sunlight hides the stars in daytime, but the ancients were aware that the stars were up there even at night, and the slow eastward motion of the sun around the sky, at the rate of about thirty degrees each month, caused different stars to be visible at night at different times of the year.

The moon, revolving around the earth each month, also has an independent motion in the sky. The moon, however, changes its position relatively rapidly. Although it appears to rise and set each day, as does nearly everything else in the sky, we can see the moon changing position during as short an interval as an hour or so. The moon's path around the earth lies nearly in the same plane as the earth's path around the sun, so the moon is never seen very far from the ecliptic in the sky. There are five other objects visible to the naked eye that also appear to move in respect to the fixed background of stars on the celestial sphere. These are the planets Mercury, Venus, Mars, Jupiter, and the Saturn. All of them revolve around the sun in nearly the same plane as the earth does, so they, like the moon, always appear near the ecliptic. Because we see the planets from the moving earth, however, they behave in a complicated way, with their apparent motions on the celestial sphere reflection both their own independent motions around the sun and our motion as well.

第26题：The ancient people believed that ________.

[A] the earth was spinning on the axis of the sky

[B] the sky was a hollow sphere spinning around the earth

[C] the patterns of stars on the sky would never change

[D] the stars around the sky were not stationary

A：VMware VCenter

B：VMwarev Sphere Hypervisor

C：VMware ESXi

D：VMware ESX

A、长方体

B、圆锥体

C、圆柱体

D、球体

Reid vapor pressure is ______．

A.exerted by liquid cargo on the sides of a tank

B.exerted by liquid cargo on a cargo hose body

C.the lowest temperature and pressure that will cause a flammable liquid to give off vapors

D.a measurement of the amount of flammable vapors given off by a liquid at a certain temperature

The force exerted by a propeller which tends to throw the stern right or left is called ______.

A.slip

B.sidewise force

C.rotational force

D.thrust

A) zones

B) areas

C) belts

D) sphere

What defines a great circle?

A.A curved line drawn on a Mercator Chart

B.A course line that inscribes a loxodromic curve

C.The shortest distance between any two points on the earth

D.The smallest circle that can be drawn on the face of a sphere

A.it

B.them

C.that

D.one

A time diagram is a diagram of the celestial sphere as observed from above the ______.

A.south celestial pole

B.north celestial pole

C.observer's meridian

D.Greenwich meridian