以下各项中属于劳动过程中的有害因素的是
A.噪声
B.个人防护用品使用不当
C.有毒工段与无毒工段在一个车间
D.劳动强度过大
E.卫生设施不健全
参考答案:D
已知三角形的顶点是A(-5,0)、B(3,-3)、C(0,2),求:
(1)AB边上的中线CD的长及CD所在的直线方程;
(2)△ABC的面积.
根据句意及首提示完成下列句子。
1. The students in this school usually wear u on weekdays.
2. We can e in the dining hall every day.
3. There are many chairs and desks in the c .
4. You can't f _ with your classmates.
5. There are r _ everywhere.