在机械制图中表达机件的方法有:视图、剖视图、剖面图、()和简化画法及其他。
参考答案:局部放大图
当百分数表示直线的坡度时,()。
A、数值的正负不能确定坡度类型
B、当数值小于零时表示是上坡
C、当数值大于零时表示是上坡
D、当数值大于零时表示是下坡
Prevention of preterm births is vital for which of the following reasons()
A. It’s costly to care for these neonates.
B. These neonates are usually mentally retarded.
C. Preterm birth causes high incidence of the neonatal deaths.
D. These neonates usually wind up with long-term health care needs.