能够反映施工工序在施工中机动时间的进度计划图是( )。
A.横道图
B.斜条图
C.S形曲线
D.网络图
参考答案:D
_____ into many languages , the book is popular with young people.
A.Having been translated
B. Having translated
C.To be translated
D.Been translated
OFDM技术的优势包括()
A.频谱效率高,
B.带宽扩展性强,
C.抗多径衰落,
D.频域调度和自适应