题型:填空题 If we keep wasting so much energy, ________are that our oil wells will dry up and the environment will be destroyed.A.problemsB.difficultiesC.questionsD.chances 查看答案
题型:填空题 采煤工作面发生煤与瓦斯突出事故后,应派2个小队分别从进风侧和回风侧进入事故地点救人。如果只有1个小分队,应从采煤工作面( )进入救人。A.进风侧 B.回风侧 C.进风侧或回风侧 D.顺着风流 查看答案