乳化炸药由以下组分构成:()。
A.硝酸盐水溶液
B.梯恩梯
C.油包水型乳化剂
D.木粉
参考答案:A, C
—I have bought a new watch .
—When and where _______ you _______ it? [ ]
A. do; buy
B. did; buy
C. have; bought
D. will; buy
实行无差异营销战略的企业把_______________看作一个大的目标市场。