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[单选题]What is the key difference between German and Japanese maglev trains? (     )  WcA答案窝(daanwo.com)-大学生作业答案及考资分享平台
AThe German maglev trains use super-cooled, superconducting electromagnets. WcA答案窝(daanwo.com)-大学生作业答案及考资分享平台
BThe German maglev trains Transrapid trains are not equipped with an emergency WcA答案窝(daanwo.com)-大学生作业答案及考资分享平台
battery power supply.WcA答案窝(daanwo.com)-大学生作业答案及考资分享平台
CThe Japanese maglev trains use super-cooled, superconducting electromagnets.WcA答案窝(daanwo.com)-大学生作业答案及考资分享平台
DThe Japanese Transrapid trains are equipped with an emergency battery power supply.
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