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【简答题】
如图所示 一个半径为R的半圆形线圈通有电流I。线圈处在与线圈平面平行向右的均匀磁场日中。线圈所受磁力矩的大小为______，______。把线圈绕OO轴转过角度______时，磁力矩恰为零。
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举一反三
【单选题】Which of the following is TRUE about Cyanovirin?
A.
It is an active ingredient in a foam, cream or suppository.
B.
It is an active ingredient applied before sex to prevent HIV transmission.
C.
It is a protein that protects the body from infection by microorganisms.
D.
It is a drag used to prevent HIV transmission.
【单选题】滚动轴承转动套圈的配合(一般为内圈与转轴轴径的配合)应采用
A.
过盈量较大的配合,以保证内圈与轴径紧密结合,载荷越大,过盈量越大
B.
具有一般过盈量的配合,以防止套圈在载荷作用下松动,并防止轴承内部游隙消失,导致轴承发热磨损
C.
具有较小过盈量的配合,以便与轴承的安装拆卸
D.
具有间隙或过盈量很小的过渡配合,以保证套圈不致因过大的变形而影响工作精度
【单选题】Which of the following is not the ingredient of five Cereal?
A.
Wheat flour
B.
Starch
C.
Salt
D.
Meat
【单选题】Which of the following is TRUE about Cyanovifin?
A.
It is an active ingredient in a foam, cream or suppository.
B.
It is an active ingredient applied before sex to prevent HIV transmission.
C.
It is a protein that protects the body from infection by microorganisms.
D.
It is a drug used to prevent HIV transmission.
【单选题】Which ingredient is responsible for being elastic in wheat flour?
A.
fiber
B.
husk
C.
bran
D.
gluten
【简答题】这个电流的大小取决于电池的电压、样本的尺寸以及材料本身的导电性。-()
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