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【多选题】
T1、T2是核磁共振成像中两个时间常数，下列叙述哪个是正确的（）.A.
T1是纵向时间，表示为MZ在激励过后恢复到最大M0这一过程的时间常数
B.
环境温度的增加会导致T1缩短
C.
T2是横向时间常数，主磁场的均匀性变坏会导致T2缩短
D.
T1、T2是人体组织的特征参数，与其它条件无关
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