钢材抵抗冲击载荷的能力,其指标是通过标准试件的弯曲( )试验确定。
A.冷弯性能
B.硬度
C.耐疲劳性
D.冲击韧性
参考答案:D
Lead values moved up to their best level since April last year in the absence of a settlement at Australia’s broken hill lead-zinc-silver mines. ( )
A.without
B.with
C.as
D.through
妊娠小便不通又称()
A.转胞
B.子痫
C.子晕
D.子淋
E.子烦