与二氢黄酮反应显天蓝色荧光的是
A．醋酸镁B．二氯化铁C．盐酸—镁粉D．三氯化铝E．三氧化二铝
参考答案：A
There is _____ like the taste of a glass of cold milk. [ ]
A. something
B. anything
C. nothing
D. everything
什么是土壤的抗陷系数P和土壤最大允许比压PO？
