用于熔融回收的废合金钢管
参考答案:72042900
My neigh bours used to give me a hand in time of trouble, _______ was very kind of them.
A.who
B.which
C.that
D.it
弯曲试验判定为微裂纹时,其结果应判定为()。
A.合格
B.不合格
C.应重试再依据判定要求判定