成缆时,加入填充主要是提高其成缆外圆的()。
参考答案:圆整性
The woman was sad after she lost her only son in the earthquake. Her friend helped her go
through the difficult period and she finally _____. [ ]
A. kept up.
B. cheered up.
C. turned up.
D. called up.
对流传热系数