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【单选题】
热泵循环中的制热过程是( )。A.
电热丝加热
B.
热水供热
C.
制冷剂汽化
D.
制冷剂的冷却冷凝
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举一反三
【单选题】We were prevented by heavy smog from _____ anything. [ ]
A.
seeing
B.
seen
C.
being seen
D.
to see
【单选题】Find out the topic of each sentence. There are three reasons why solar energy has not been made use of widely.
A.
There are three reasons
B.
why solar energy has not been made use of widely.
【单选题】In the modern world, computers are more and more widely__ in people’s life. [ ]
A.
use
B.
using
C.
used
D.
to use
【简答题】命令接口演化为两种主要形式,分别是()和()
【单选题】We were prevented ________ the project on time by the bad weather. [ ]
A.
to complete
B.
completed
C.
completing
D.
from completing
【单选题】下面的各种设备中，(16)既是输入设备，又是输出设备。(17)组设备依次为输出设备、存储设备、输入设备。(18)用于把摄影作品、绘画作品输入到计算机中，进而对这些图像信息进行加工处理、管理、使用、存储和输出。不属于输入设备的是(19)。
A.
扫描仪
B.
打印机
C.
键盘
D.
键盘
【单选题】We were prevented by heavy_____from seeing anything.
A.
foggy
B.
smog
C.
smoked
D.
smoking
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