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【简答题】
在比较两条单色X射线谱线波长时，注意到谱线A在与某种晶体的光滑表面成【图片】的掠射角时出现第1级反射极大。谱线B（已知具有波长0.097nm）则在与同一晶体的同一表面成【图片】的掠射角时出现第3级反射极大，则谱线A的波长为【图片】 nm（小数点后保留三位）。
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参考解析：
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举一反三
【单选题】In the wake of 11 September, Visionics, a leading manufacturer, issued a fact sheet explaining how its technology could enhance airport security. They called it "protecting civilization from the faces...
A.
any way, the face-recognition technology is good enough to frighten the terrorists
B.
the industry will have to recognize the real situation and work hard to improve the technology
C.
all the claims are premature
D.
we must not expect too much
【单选题】Passage 4 In the wake of 11 September, Visionics, a leading manufacturer, issued a fact sheet explaining how its technology could enhance airport security. They called it "protecting civ...
A.
Too many false alarms were raised.
B.
Everyone should look straight at the camera.
C.
Only 90% of suspects at an airport were found.
D.
Everyone should not disguise himself.