负辐射正确的是( )
A. 当周围空气温度低于人体表面温度时,人体容易散热
B. 当周围物体表面温度超过人体表面温度时,周围物体对人体发射热辐射
C. 当周围物体表面温度低于人体表面温度时,人体向周围物体辐射散热
D. 当周围空气温度高于人体表面温度时,人体容易散热
E. 以上都不是
党的十七大报告指出,新时期最突出的标志是( )。
A. 快速发展
B. 与时俱进
C. 改革开放
D. 和谐社会
Mary was compelled to take in washing to help support her family.
A. pleaded
B. appealed
C. forced
D. instructed
A) possible C) carelessB) likely D) worried
A. possible
B. likely
C. careless
D. worried