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【单选题】
织物经向紧度是指织物规定面积内____ 的面积占 的百分比。A.
经纱、织物总面积
B.
纬纱、织物总面积
C.
经纱、纬纱
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【单选题】黑云母Ng≈Nm为深棕色，Np为淡黄色，已知主折射率为1.697、1.696、1.616，Np∧c=3°，请问黑云母的轴性光性（ ）
A.
一轴正晶
B.
一轴负晶
C.
二轴正晶
D.
二轴负晶
【简答题】Folk dancing in the United States is very fast; people 6)_______________. 4. The dancers wear 7) _______________.That makes the dances pretty to watch.
【简答题】黑云母Ng≈Nm,已知主折射率为1.697、1.696、1.616,Np∧c=3°,请问⊥Bxa切面的双折射率值是( )
【简答题】黑云母Ng≈Nm，已知主折射率为1.697、1.696、1.616，Np∧c=3°，请问⊥Bxo切面的双折射率值是（ ）
【单选题】In the United States the most popular form. of folk dancing since the early days has been square dancing. In early times, when men and women worked in groups to【21】a barn(谷仓) for harvest crops, they d...
A.
make
B.
set up
C.
build
D.
form
【简答题】???? In the United,States the most popular form. of folk dancing since the early days has been square dancing．In early times，when men and women worked in groups to （1） a barn(谷仓)for harvest crops，they...
【单选题】The original purpose of folk dancing in China was to…
A.
celebrate cultural differences.
B.
continue cultural traditions.
C.
help provide enough food for people.
D.
unite different ethnic groups throughout China.
【单选题】黑云母Ng≈Nm为深棕色，Np为淡黄色，已知主折射率为1.697、1.696、1.616，Np∧c=3°，请问黑云母⊥（001）切面上的颜色及解理特征（ ）
A.
Ng=深棕色、Nm=深棕色，无解理
B.
Ng或Nm=深棕色、Np=淡黄色，无解理
C.
Ng或Nm=深棕色、Np=淡黄色，一组极完全解理
D.
Ng=深棕色、Nm=深棕色，一组极完全解理
【单选题】完成下列各题 In the United,States the most popular form. of folk dancing since the early days has been square dancing．In early times，when men and women worked in groups to 21________ a barn(谷仓)for harvest c...
A.
make
B.
set up
C.
build
D.
form
【单选题】黑云母 Ng≈Nm 为深棕色, Np 为淡黄色,已知主折射率为 1.697 、 1.696 、 1.616 , Np ∧ c=3° ,请问黑云母的轴性光性( )
A.
一轴晶正光性
B.
一轴晶负光性
C.
二轴晶正光性
D.
二轴晶负光性
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