The sample, after being purged by reversed extraction and purified byPVP - kieselguhr column, was enriched through Amberlite XAD - 7 column. 样品经过乙酸乙酯反萃取及PVP - 硅藻土层析柱后, 再径XAD - 7柱浓缩.
南北朝时期, 区内建置多变, 辖域无常.Northern and Southern Dynasties period, region to build ever - changing, volatile scope.否定伴随着许多问题,否定辖域就是其中之一.Scope is among the many problems concerning negation.本文的重点是讨论在Prolog语言中如何实现对含有量化词辖域歧义的语句的消歧...
西维因烟剂防治效果为 31.51%,氯氰菊酯烟剂防治效果为97.68%.The control effect of DDVP . carbaryl and cypermethrin smoke agents were 95.85 % 31.51 % and 97.66 % respectively....
They struggled to limit the cost by enforcing a low-tech specification.他们通过实施低技术规格拼命限制成本。These may be laudable aims, but by enforcing them at gunpoint another vitally important principle is lost.也许用心是好的，但若诉诸枪杆子则无法坚持另一个至关...