缓冲器箱底部四角的裂纹当长度为小于（）的情况下可以补焊。
参考答案：100mm
Normally you could stay with us, but our house ______ at the moment.
A．is decorated
B．was decorated
C．is being decorated
D．was being decorated
外观质量检查测量方法主要有（）和色差。
A、缺损
B、裂纹
C、弯曲
D、杂质凸出高度
