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问题
填空题
半自动闭塞.()区段,进站信号机为色灯信号机时,应设色灯预告信号机或接近信号机。
答案
参考答案:自动站间闭塞
选择题
— I wonder if you could go with me to the supermarket.
— Don't disturb me. I _______ my experiment report all the morning and haven't finished yet.
A. write
B. was writing
C. have written
D. have been writting
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判断题
离子选择性电极的选择性反映其他共存离子对被测离子的干扰。( )
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