The synthetic method, main properties and application of alkyl indican has been introduced.本文介绍了烷基糖苷的合成方法, 主要性能和用途.This preparation uses dialkyl imidazole salt, alkyl pyridine salt or caprolactam and fatty acid as reacta...
Send a cheque for £18.99 plus £2 for postage and packing.请寄上18.99英镑的支票,外加2英镑的邮资和包装费。Proof of postage will not be accepted as proof of receipt.邮资单据不能当作收据。For foreign orders postage is extra.国外订单邮费另计。...
You'll never quite get rid of every last bit of grit.无法把所有的沙砾都清除干净。I pretended to rub a fleck of grit from one eye.我假装拭去一只眼睛里的沙粒。He felt tiny bits of grit and sand peppering his knees.他感到细小的沙砾不断打在膝盖上。...