在生产中无菌室门允许打开()S开度()。
参考答案:15;三分之一
读等高线地形图回答下列各题
(1)地形名称:
A______;B______;C______;D______;E______;
(2)图中等高距为______米;
(3)G点和F点的相对高度是______米.
The machine ____. It has worked for years. [ ]
A. didn't work
B. wasn't working
C. doesn't work
D. isn't working