1.The whole community felt great ________(同情) for the family's bad luck. 2.David really has a th...

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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

Reading Having been read To be reading Having been reading

to take being taken taking taken

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

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

2 3 4 5"

balances drowns benefits Gathers

above all in a word on the whole in other words

NW-SE N-S E-W NE-SW

0.084μgRE 0.167μgRE 0.363μgRE 0.631μgRE 1.000μgRE

when during which since then since when

FSE T₂WI 2D GRE T₁WI SE T₁WI 3D GRE T₁WI STIR T₂WI

200μgRE／d 300μgRE／d 400μgRE／d 500μgRE／d

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序列使部分纵向磁化转变为横向磁化 GRE序列对磁场的稳定性和梯度切换要求不高

an; the \ ;an an ;an the ;an