By 1978, in the USA, the use of CFCs in aerosol propellants was banned.美国自1978年起禁止在喷雾剂压缩气体中使用含氯氟烃。This law closely resembles that obtained with conventional propellants.这种规律非常类似于用普通推进剂所得出的规律.The lighter version used liqu...
The lighter version used liquid hydrogen, the heavier used hypergolic propellants.较轻的推进器采用液态氢, 较重的采用自燃推进剂.Pressure - fed engines are particularly susceptible to dissolved gas in the propellants.挤压 式 发动机对推进剂中溶解的气体特别敏感.Thi...
He said in reply that the question was unfair.他回答说这个问题不公平。They went ahead without waiting for a reply from the Germans.他们没等德国人答复就接着往下推进。I have received neither an acknowledgment nor a reply.我未收到任何复函或答复。...
很抱歉,这幅画是非卖品.I'm sorry — this painting's not for sale.格雷泽家族已经强调曼彻斯特联是非卖品.The Glazer family have insisted that Manchester United are not for sale.对不起, 他们专供外销,在中国是非卖品.I'm sorry , but they are for export for i...