isothiocyanic acid英美网络 异硫氰酸化学双语例句Isothiocyanic Acid Phenyl Ester;硫代异氰酸苯酯;Theoretical Study of Reaction Mechanism of Silylene with Isothiocyanic Acid硅烯与异硫氰酸反应机理的量子化学研究