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【单选题】
某三相异步电动机正通电运行，测其端电压为220V。查看其铭牌，标有220V、60W字样。下列说法正确的是（）。A.
电机一定在额定功率下工作
B.
电机一定在额定电流下工作
C.
电机一定在额定电压下工作
D.
电机一定在额定电压、额定功率下
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【单选题】It may take large bodies of water and ice decades to respond to changes in temperature.
A.
Y
B.
N
C.
NG
【单选题】An ______is very large piece of ice floating in the sea.
A.
ice box
B.
iceberg
C.
ice cream
D.
iceland
【单选题】Large chunks of ice and snow melt very slowly. Once they begin to melt, several weeks of warm weather may be required before they are totally dissolved .
A.
融化
B.
融合
C.
发现
D.
旋转
【单选题】For the【C1】______month, mysterious falls of large chunks of ice(冰雹)【C2】______rained down on Spain and Italy. Juana Sanchez, a 70-year-old woman in Almeria, southern Spain, was knocked 【C3】______when s...
A.
last
B.
past
C.
passed
D.
early
【单选题】Glaciers are large masses of ice on land that show evidence of past or present movement. They grow by the gradual transformation of snow into glacier ice. A fresh snowfall is a fluffy mass of loosely ...
A.
The effect of glaciers on climate
B.
Damage from glaciers
C.
Glacier formation
D.
The location of glaciers
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