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had taught taught is teaching has been teaching
GRE幅值较SE小，图像信噪比高 GRE幅值较SE小，图像信噪比低 GRE幅值较SE大，图像信噪比高 GRE幅值较SE大，图像信噪比低 GRE幅值较SE小，图像信噪比相同
has taught was teaching taught had been teaching
missed to miss miss missing
sing; singing sings; sing sing; sings singing; sing
GRE序列是用90°射频脉冲所激发的 GRE序列有较长TR时间 GRE序列使用180°聚焦脉冲 GRE序列回波强度按T*2衰减 GRE序列对磁场的稳定性和梯度切换要求不高
had taught taught is teaching has been teaching
singing to sing sings sing
GRE幅值较SE小，图像信噪比高 GRE幅值较SE小，图像信噪比低 GRE幅值较SE大，图像信噪比高 GRE幅值较SE大，图像信噪比低 GRE幅值较SE小，图像信噪比相同
had taught is teaching taught has been teaching
had taught taught is teaching has been teaching
0.084μgRE 0.167μgRE 0.363μgRE 0.631μgRE 1.000μgRE
when Miss Liu will leave when Miss Liu left when did Miss Liu leave when will Miss Liu leave
when Miss Smith will arrive when will Miss Smith arrive how will Miss Smith arrive why hasn't Miss Smith arrived
when Miss Liu will leave when Miss Liu left when did Miss Liu leave when will Miss Liu leave
sing sang were singing are singing
had taught taught is teaching has been teaching
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