The reaction conditions on oxidation of 2 - methylpyridine to 2 - acid by oxidation of potassium dichromate were studied.研究了以2-甲基吡啶为原料,以重铬酸钾为氧化剂,利用化学氧化法合成 2- 吡啶甲酸的反应条件....
The strains of office are beginning to tell on the prime minister.首相开始感到公务繁忙的压力了。She could hear the tinny strains of a chamber orchestra.她能听见室内管弦乐队尖细的旋律。Every year new strains of influenza develop.每年都有新的流感病毒出现。...
More vigorous action is needed to force the federal army to disengage.需要更强有力的行动来迫使联邦军队撤军。He accepted the invitation, but was later forced to disengage himself.他接受了邀请, 但后来被迫失约.Consider ability to easily disengage peripher...
他载着一大车干草驶过。He drove by with a big load of hay.他能闻到粪臭和清新的干草味。He could smell muck and clean fresh hay.一支香烟把干草点燃了。A cigarette set the dry grass alight ....