计算-8+4÷(-2)结果为______.
-8+4÷(-2)
=-8-2
=-10.
故答案为:-10
钙基润滑脂主要用于汽车、拖拉机等机械设备上,使用温度范围为()。
A.-10~60℃
B.-10~100℃
C.-10~140℃
D.-10~160℃
Directions:
The following chart shows the percentage of near-sighted students in Chinese schools. Write an essay of 160~200 words based on the chart. In the composition you should:
1) describe the situation
2) analyze the causes, and
3) give your comments.