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【简答题】我国交流电的频率为（ ），周期为（ ）。
【单选题】Upon arrival, the pioneers who settled a new area of the frontier would eat which of the following?
A.
Corn, cattle, arid pigs.
B.
Indian maize, native fruits, and wild meat.
C.
Preserved fruits, dried meats, and pine roots.
D.
Fresh food and native vegetables.
【单选题】Upon arrival, the pioneers who settled a new area of the frontier would eat which of the following?
A.
Com, cattle and pigs.
B.
Indian maize, native fruits and wild meat.
C.
Preserved fruits, dried meats and pine roots.
D.
Fresh food and native vegetables.
【简答题】我国交流电的频率为 。
【单选题】Upon arrival, the pioneers who settled a new area of the frontier would eat which of the following?
A.
Corn, cattle, arid pigs.
B.
Fresh food and native vegetables.
C.
Indian maize, native fruits, and wild meat.
D.
Preserved fruits, dried meats, and pine roots.
【单选题】The fact that______can be learned about the 'new frontier' in the text.
A.
Japan has been looking beyond the 'new frontier'
B.
it is filled up with corporate competitors
C.
it results in a major global revival recently
D.
Japanese firms are the latecomers in this area
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