奥氏体不锈钢与铁素体钢焊接时,易出现的问题是()。
A.焊缝熔合线低温冲击韧性值升高
B.焊缝熔合线低温冲击韧性值下降
C.焊缝热影响区冲击韧性升高
D.产生气孔
参考答案:B
Prices____ all the time and no one knows when they stable.
A.are going up; become
B.have been going up; will become
C.have gone up; will become
D.have been gone up; become
体内摄取过量磷、汞、砷、苯等化学物质弓起鼻出血的原因是()
A.凝血障碍
B.小血管损伤
C.破坏造血系统
D.内源性凝血酶原减少
E.血小板异常