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【单选题】
质量为m的小球，从离桌面H处由静止下落，桌面离地面高为h，设桌面处物体重力势能为零，空气阻力不计，那么，小球落地时的机械能为（ ）A.
B.
C.
D.
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举一反三
【单选题】If you have a cold, remember to ______.
A.
drink small amounts of alcohol
B.
clear your throat before speaking
C.
use your tongue and lips carefully
【单选题】Vitamins necessary in small amounts in the diet for the normal growth and maintenance of are needed for______ foods into energy and body maintenance.
A.
shifting
B.
transferring
C.
altering
D.
transforming
【单选题】Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals, including man. They do not provide energy,【21】 do they construct or buil...
A.
either
B.
so
C.
nor
D.
never
【单选题】在变压器差动保护中,由于两侧电流互感器二次阻抗不完全匹配造成的不平衡电流在计算时引人电流互感器同型系数、电流互感器变比误差系数及( )等措施。
A.
电流平衡调整
B.
非周期分量系数
C.
电压平衡调整
D.
电压互感器的变比调整
【单选题】Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals, including man. They do not provide energy,【31】do they construct or build...
A.
either
B.
so
C.
nor
D.
never
【单选题】Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals, including man. They do not provide energy,【21】do they construct or build...
A.
either
B.
so
C.
nor
D.
never
【简答题】produces small amounts of waste?__________
【单选题】在变压器差动保护中，由于两侧电流互感器二次阻抗不完全匹配造成的不平衡电流在计算时引入（）、电流互感器变比误差系数及非周期分量系数等措施。
A.
电流互感器同型系数
B.
电流平衡调整
C.
电压平衡调整
D.
调整电压互感器的变比
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