制作可摘局部义齿印模选择的托盘时,要求托盘的侧翼与牙弓内外侧应有的间隙是()
A.1.0mm
B.1~2mm
C.2~3mm
D.3~4mm
E.5mm
参考答案:D
Very long noises in the factory can _____ people mad. [ ]
A. make
B. have
C. cause
D. drive
能同时断开DNA双链,使部分DNA处于松弛状态,利于复制()
A.剪接体
B.核酸外切酶
C.RNA聚合酶
D.DNA连接酶
E.拓扑异构酶