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【简答题】
有三个大小 20 Ω的电阻作为三相对称负载接到三相电源上,若已知三相电源线电压为 380V ,求: ( 1 )三个电阻接成 Y 形,采用三相四线制接入时,线电流、相电流和中线电流的大小; ( 2 )三个电阻接成 Δ 形,线电流、相电流的大小。
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【简答题】Some kids start to drink alcohol (酒精) at a young age. They think it is part of becoming an . They also think drinking is not that bad because so many people do it. They feel it is not as bad as t...
【单选题】— Anything to drink? What about coffee? —Er...I think I'll have a cold drink ________ coffee. [ ]
A.
other than
B.
more than
C.
less than
D.
rather than
【单选题】Most people today think of chocolate as something sweet to eat or drink that can be easily found in stores around the world. It might surprise you that chocolate was once highly treasured. Researchers...
A.
How ancient people used cacao plants.
B.
Chocolate was valuable thousands of years ago.
C.
Many ancient people farmed cacao plants.
D.
How the cacao plant was made into chocolate.
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