图三所示作品的创作年代是()。
A.西汉
B.东汉
C.三国
D.西晋
参考答案:B
121. I was uncertain of my success. Which of the following can replace the underlined word?
A.willing
B.not sure
C.certainly
D.not certainly
影响天线覆盖范围的主要因素只有天线挂高。