传播模型的选择与覆盖区域的半径有关,一般认为,当覆盖半径大于()时,统计型模型的预测精度比较理想。
A.100m,
B.500m,
C.1000m,
D.35km.
参考答案:C
With all his family, friends and money gone, he felt ____ hopeless and killed himself. [ ]
A. hardly
B. luckily
C. sincerely
D. Whatever
人类成熟的精子中有( )
a.23个染色单体 b.46个染色单体 c. 23个DNA d. 46个DNA e .22+X f. 22+Y
A.ace
B.bdf
C.adf
D.acf