【简答题】河岸溢洪道的类型主要有()、()、()和()四种。
【单选题】The factory produces half a million pairs of shoes every year , 80% are sold abroad.
【多选题】正常式溢洪道的分类有()、()、()、()。
【单选题】The factory ________ since February of 1988.
【多选题】河岸溢洪道从流态的区别可分为以下几种类型().
【单选题】The factory used 65percent of the raw materials, the rest of which ________(be)saved for other purposes.
【简答题】The factory workers are ________ to poisonous gases and many of them suffer from lung diseases.(expose)