属于NMDA受体拮抗剂的药物是（）
A.卡巴拉汀
B.美金刚
C.奥拉西坦
D.苯海索
参考答案：B
税前利润是指没有扣除利息的经营利润。（）
How do you understand the relationship between the grammatical forms of a language and their communicative functions
