【单选题】_____ I've said before, nobody should drop out college.
【单选题】Nobody should drop out of college _______ they believe they face a chance of a lifetime.
【单选题】Nobody should drop out college ________ they believe they face the opportunity of a lifetime.
【单选题】下列抗结核药物中,不属于二线抗结核药物的是
【简答题】拉伸性能试验一共分为四个阶段,第I阶段为_____阶段。