钻孔灌注桩D=1.2时，按《JGJ106-2014》规范，每根受检桩的钻芯孔数为（）
A.1孔
B.2孔
C.3孔
D.4孔
参考答案：B
The output of the gold mine is now four times _____ it was before liberation.
A．that
B．what
C．which
D．than
主链含5个碳原子，有甲基、乙基2个支链的烷烃有3种。
