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【单选题】
虚拟现实技术(VR)是指采用以( )为核心的现代高科技手段生成逼真的视、听、触觉等一体化的虚拟环境,用户借助特殊的设备以自然的交互方式与虚拟世界中的物体进行交互,相互影响,从而产生亲临真实环境的感受和体验。A.
虚拟建模技术
B.
运动仿真技术
C.
通信技术
D.
计算机技术
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【单选题】奥氏体晶粒度的影响因素很多，下列叙述中不正确的是（）。
A.
同一种钢加热温度越高奥氏体晶粒越粗大；
B.
相同温度下晶粒随保温时间的延长而变得粗大；
C.
其他条件相同的情况下，加热速度越快奥氏体晶粒越粗大；
D.
本质细晶粒钢，是指晶粒不容易长大的钢。
【简答题】Ancient people had little idea of the nature of the earth’s suce. But if they lived on the seashore, they knew that there was land and sea. People who lived near the sea noticed that there were two...
【单选题】of the land in that district covered with trees and grass.
A.
T wo-fifth; is
B.
Two-fifth; are
C.
Two-fifths; is
D.
Two-fifth s; are
【单选题】— The land in the southwest of China is in great need of ____. — Yes, it hasn ’ t rained for a long time there.
A.
milk
B.
tea
C.
coffee
D.
water
【判断题】In the broadest sense, bid prices for land are based on the present value of the utility it yields to bidder.
A.
正确
B.
错误
【单选题】— The land in the southwest of China is in great need of _______. — Yes，it hasn’t rained for a long time.
A.
coffee
B.
juice
C.
water
D.
tea
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