用砂石桩处理地基时，砂石桩的布置形式宜为( )。
A．矩形布置
B．等腰三角形布置
C．正方形布置
D．等边三角形布置
参考答案：C,D
Southern印迹的DNA探针可与以下何种成分杂交()
A．只与完全相同的片段
B．可与任何含有相同序列的DNA片段
C．可与任何含有互补序列的DNA片段
D．可与用某些限制性内切核酸酶切成的DNA片段
E．以上都是
The new stadium being built for the next Asian Games will be ________ the present one.
A．as there times big as
B．three times as big as
C．as big as there times
D．as big there times as
