骨骺损伤固定时间为()。
A.1~2周
B.2~3周
C.3~4周
D.4~6周
E.6~8周
参考答案:C
设备小管道气压试验所用的气体为( )。
A.空气B.二氧化碳C.压缩空气或惰性气体D.氧气
Direction:For this part,you have to write a short passage on the topic:Volunteer Teaching in the West.You should write at least 150 words following the outline given below in Chinese: 1.每年,高校许多大学生受到鼓舞去贫困地区支教; 2.支教活动的意义; 3.你的看法。