钻进中发生井侵，表明了井内是负压差。
参考答案：错
Nowadays everything strange is____strange. That is to say, any unexpected ____thing is possible to happen.
A．something
B．anything
C．nothing
D．everything
等腰三角形的底边长为10cm，腰长为13cm，它的面积是_________cm2．
