在油脂性基质中有适宜的稠度和涂展性的基质是（）
A.羊毛脂
B.凡士林
C.蜂蜡
D.豚脂
E.液状石蜡
参考答案：B
I want to buy a nice present ________ my mother and I must give it ________ her myself.
A．for; to
B．to; for
C．with; to
D．for; for
浇筑混凝土前应对钢筋骨架的尺寸、位置等进行（）并校正。
