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问题
单项选择题
GPS各卫星发射信号()不同。
A.频率
B.时间
C.伪码
D.幅度
答案
参考答案:
C
选择题
This is the best way I could think of ______________ into the dangerous area.
A. stopped people getting
B. to protect people from getting
C. to prevent people getting
D. keeping people from getting
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单项选择题 A1/A2型题
0~6个月婴儿添加的第一种辅食是()
A.菜汤
B.蛋黄
C.米粉
D.配方奶粉
E.水果
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