同一句中主句用一般现在时定语从句却用一般过去时

1 同一句中主句用一般现在时定语从句却用一般过去时

The XPS board was produced by Harbin Xin Hai Trading Co., Ltd. Its thickness is 10cm in the NSTIL, which was decided by the relevant research results [28]

此句中，Its thickness is 10cm in the NSTIL中的is，和which was decided by中的was是不冲突？是不是要将is改成was才合适？

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分类：动词时态

最佳答案 2019-01-20 09:49

The XPS board was produced by Harbin Xin Hai Trading Co., Ltd. Its thickness is 10cm in the NSTIL, which was decided by the relevant research results.

【翻译】XPS板（一种板材名称，由木材或者钢材制作的）由哈尔滨鑫海贸易有限公司生产的。其厚度在NSTIL中为10厘米，这是由相关研究结果确定的。

was produced ：被动语态。指这种板材在过去生产的。

is 10cm ：指现在的尺寸。

was decided ：被动语态。“确定”这个动作在过去发生。

总体看，这个句子出现了两种时态。被动语态使用过去时，指发生在过去的动作，一般现在时指客观存在的尺寸，不受时态限制。其实，is 10cm 改为 was 10cm，也可以。都按照过去时间范畴理解即可。