厚壁空洞的洞壁厚度超过（）
A.3mm
B.5mm
C.7mm
D.9mm
E.10mm
参考答案：A
调试车服务号为（）。
A block of flats are being to make room for a supermarket.
A．knocked into
B．knocked over
C．knocked off
D．knocked down
