The NPER worksheet function requires you to supply a periodic payment value instead of a future value.

NPER工作表函数要求给出定期支付值，而不是未来值。

The naphthol-based epoxy resin (NPER) was synthesized from 1-naphthol in the presence of catalyst and its characteristic properties were measured in this work.

本研究以1-萘酚为原料，在催化剂的作用下合成了萘基环氧树脂（NPER），并对其特征性质进行了测试。