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【简答题】
今有鸡兔同笼,上有三十五头,下有九十四足,问鸡兔各几何?鸡 只,兔 只。
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【单选题】Elephants like eating ____, but lions like eating ____. [ ]
A.
grasses; meats
B.
grasses; meat
C.
grass; meats
D.
grass; meat
【多选题】均匀光纤芯与包层的折射率分别为：n1=1.50,n2=1.45，则光纤层与包层的相对折射率差和光纤的数值孔径分别为（）和（）
A.
0.016
B.
0.033
C.
0.384
D.
0.521
【简答题】The Tough Grass That Sweetens Our Lives Sugar cane was once a wild grass that grew in New Guinea and was used by local people for roofing their houses and fencing their gardens. Gradually a different ...
【单选题】-Young man, come off the grass; we forbid________ on the grass here. -Sorry, I didn’t notice it.
A.
to stepping
B.
stepping
C.
why
D.
which
【单选题】(2013·重庆部分学校高三联考)At the edge of the grass，there's a sign saying“________ the grass”．
A.
Keep up
B.
Keep away
C.
Keep off
D.
Keep back
【单选题】已知均匀光纤纤芯与包层的折射率分别为n1=1.50,n2=1.45,光纤纤芯与包层的相对折射率差为多少?
A.
0.0412
B.
0.232
C.
0.0725
D.
0.0328
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