Fans from miles around crowded into the stadium for the concert of Jay Chou on September 4^th, 2010, _________ are popular with teenagers.

A．many of his songs

B．many of whose songs

C．many of which songs

D．and many of whose songs

对按承载力计算的详勘勘探孔的深度，条形基础一般可取( )

A．6.0b
B．4.5b
C．3.0b
D．1.5b