pre-exist

The result showed that: ( 1) the subjects with the computer-based illustrating tool scored higher significantly than the subjects with pre-exist illustration;

结果表明，（1）基于计算机的插图工具下的测验得分显著高于预置插图；

The pre-exist amphibolite facies rocks in the fracture belt have been superimposed by retrograde green-schist facies with neoformation of chlorite, anthophyllite, sericite and cordierite.

断裂破碎带岩石在先存的五台期角闪岩相变质岩之上，叠加了绿片岩相动力退变质作用，普遍出现绿泥石、直闪石、绢云母、堇青石等新生的变质矿物。

The average discharge field intensity of pre-exist DC voltage superimposed with switching impulse voltage increases with increasing DC composition and rod-plane was more influenced than soft line.

预先存在的直流电压对直流叠加操作冲击电压放电特性有一定影响，即直流叠加操作冲击放电的平均击穿场强随直流电压成分增大而增大，且棒-板间隙受影响程度大于软母线相地间隙。

Did this condition pre-exist?

这种情形先前存在 吗 ?