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．如图所示，一束光线由某种介质射向该介质与空气的交界面，发生反射和折射．当入射角i=300时，折射光线与反射光线恰好垂直，则该介质的折射率为
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【单选题】What regulation was issued by New York State concerning beverage containers?
A.
Beverage companies should be responsible for collecting and reusing discarded plastic soda bottles.
B.
Throwaways should be collected by the state for recycling.
C.
A fee should be charged on used containers for recycling.
D.
Consumers had to pay for beverage containers and could get their money back on returning them.
【单选题】What is the regulation regarding the raising of the American National Flag?
A.
It should be raised by soldiers.
B.
It should be raised quickly by hand.
C.
It should be raised only by Americans.
D.
It should be raised by mechanical means.
【简答题】What kind of regulation is expected by Stoppleman? Is it possible in the eyes of the interviewer?
【单选题】在某杀菌剂药效试验中，防治区病情指数防治前后由 25 变成 30 ，对照区由 20 增至 60 ，则该杀菌剂的防治效果为（ ）。
A.
60%
B.
87.5%
C.
50%
D.
-20%
【简答题】以下除哪项外,皆为白虎汤证的主证:
【单选题】What is the discussion mainly about?
A.
The history of large corporations
B.
The regulation of business by government
C.
Why corporations have so much power
D.
Ways that governments spend money
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