There is a discount _____ warm clothes.[ ]
A. in
B. on
C. at
D. with
答案:B
制作金属烤瓷桥蜡型时,桥体龈端应离开牙槽嵴()
A.0.5mm
B.1mm
C.2mm
D.2.5mm
E.3mm
速燃期(汽油机)