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【单选题】

D One moment it was quiet and calm in the forest, the next, the air was charged with tension. The elephant had heard the distant alarm calls of animals and her mood suddenly changed. I urged the elephant deeper into the forest. We sounded like a forest fire --- cracking, snapping, trailblazing. But through all the noise came a sharp warning cry. The elephant stopped and we heard it again --- the tell-tale call of a spotted deer. I looked quickly around the shadows of the forest. Rays of sunlight shone through tree branches, beneath which the patchwork(交错)of green plants and shadows-within-shadows would make tiger stripes(条纹)look more attractive. Apart from an occasional noise from the elephant’s stomach, the forest was silent. Gradually, the tension slipped from our bodies. The elephant seized a nearby branch and put it into its mouth. I reached forward and gently moved my hand over the elephant’s neck; there was a soft part, free of wrinkles and hairs, behind her ear. This was my fourth time to sense the aura of the forest in Corbett, although I saw no tigers in the end. Located at the foot of the Himalayan mountains, Corbett is home to about 135 Bengal tigers, but the forest seemed to be guarding their whereabouts(出没处), a silent reminder of their secrecy and rarity. Still, I was happy enough touching the elephant behind the ear. If I had so desperately wanted to see a tiger, I could have gone to a zoo. After all, spotting tigers merely confirms their beauty; tracking them can make you aware of something more. How does the author feel after several visits to Corbett

A.
Seeing a Bengal tiger is quite thrilling.
B.
It is very time-consuming to travel in Corbett.
C.
It is really worthwhile to study the animals in Corbett.
D.
The process of finding Bengal tigers is most appealing.
题目标签:条纹
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【单选题】用裂隙灯显微镜观察角膜基质皱褶和条纹的方法正确的是()。

A.
宽裂隙背面投照法
B.
宽裂隙弥散投照法
C.
窄裂隙间接投照法
D.
窄裂隙直接投照法

【简答题】关于干涉与衍射条纹(  )

A.
干涉条纹一定呈现等间距,单缝衍射条纹一定呈现不等间距
B.
干涉条纹一定呈现不等间距,单缝衍射条纹可能呈现等间距
C.
干涉条纹可能呈现不等间距,单缝衍射条纹一定呈现不等间距
D.
干涉条纹可能呈现等间距,单缝衍射条纹也可能呈现等间距

【多选题】关于测量干涉条纹直径的操作,下列表述正确的是

A.
中心暗斑是零级暗纹,叉丝从中心向左侧移动,依次从1级暗环、2级暗环一直移动到15级暗环
B.
叉丝返回14级暗环开始记录其直径左侧坐标值,并依次记录13级一直到1级暗环的直径左侧坐标值
C.
叉丝越过中心暗斑,继续记录1级、2级一直到14级暗环右侧直径坐标值
D.
叉丝左右移动过程中都要数清暗环级数且避免中途反向移动叉丝引起回程差

【单选题】牛顿环干涉条纹的特点有()

A.
明暗相间,等间距的直条纹
B.
明暗相间, 等间距同心圆环
C.
明暗相间,随机性条纹
D.
明暗相间 , 内疏外密的同心圆环

【单选题】下列实验干涉条纹中哪一种属于等倾干涉条纹?

A.
牛顿环
B.
劈尖干涉
C.
均匀厚度的薄膜干涉
D.
杨氏双缝干涉

【单选题】单缝夫琅禾费衍射的衍射条纹,( )。

A.
各级明纹等宽度
B.
各级明纹等亮度
C.
级数越高条纹越窄
D.
级数越高条纹越暗