地面有效辐射
参考答案：地面发射的辐射与地面吸收的大气逆辐射之差，称为地面有效辐射。
After the mass shootings at Sandy Hook Elementary School, President Obama ordered his members to ________ solutions to gun violence.
A．put up with
B．come up with
C．keep up with
D．catch up with
普鲁卡因皮内试验的进皮剂量是
A．20单位/0.1 mlB．250单位/0.1 mlC．15单位/0.1 mlD．0.25 mg/0.1 mlE．50 μg/0.1 ml
