脱硫后的乙烯与氢气混合，进入脱炔床前必须加热至（）℃。 ["50～70","60～80","50～90","70～90"]
枚（MEI）系统经济学中的E指代（） ["A、物料","B、能量","C、信息","D、科技"]
以下哪些是危险废物（） ["A.废矿物油","B.医疗废物","C.家庭日常生活中产生的废药品及其包装物","D.废温度计"]
添加剂硬脂酸钙是一种（）剂。 ["增白剂","热稳定剂兼润滑剂","防腐剂","开口剂"]
G to C的全称是以下哪个（） ["A、Government to Citizen","B、Government to Customers","C、Government to Business","D、Government to Consumer"]
桩筏基础，选择弹性地基梁计算模型，复合桩基，输入地质资料，此时板底土反力基床系数建议值K如何由程序自动求出的？
