电弧冷焊灰铸铁具有（）特点的说法是错误的。
A. 半熔化区不易形成白口铸铁组织
B. 半熔化区极易形成白口铸铁组织
C. 焊缝和热影响区的冷却速度大
D. 焊接接头加工困难
In securing deck loads for an ocean tow，drill pipe should be（）.
A. galvanized to protect against corrosion
B. held in place with heavy materials such as spare pendant wire
C. limited to no more than five courses high
D. provided with bulwarks at both ends of their bay
农业银行的并购贷款期限一般不超过（）年，总行级核心客户与行业重点客户并购贷款期限可延长至（）年。
A. 3；5
B. 5；7
C. 5；6
D. 2；5
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