非碳酸盐硬度是指（）。
参考答案：水中钙、镁的氯化物、硫酸盐和硅酸盐等的含量
Heroes ______ their life ______ becoming the best they can be, whether it is President of the United States, a mother, or a firefighter.
A．prevent…from
B．devote…to
C．prefer…to
D．suffer…from
传媒上市之弊？
