纤溶系统由()、纤溶酶、()、纤溶酶原活化素组成。
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The crankshafts on the large modern 2-stroke crosshead engines are ()big ()makes as a single unit and so are constructed by joining together individual forgings.
A. enough;to
B. too;to
C. such;so
D. so;that
消毒乳的种类有:全脂消毒乳、强化消毒乳和()三类。