剖面图中,投射方向线用两段粗实线绘制,长度宜为()。
A.6~10mm
B.4~6mm
C.5~8mm
D.3~6mm
参考答案:B
在系统性红斑狼疮发病的病因中不包括以下哪项内容()
A.环境因素
B.饮食因素
C.性激素
D.遗传因素
E.免疫功能紊乱
— Would you please give an example to show how useful a computer is?
— Sure. __________ people get __________ information from it every day.
A.The number of; a lot of
B.A huge number of; plenty of
C.Many a; a great deal of
D.Lots of; a lot