Centrifugal pumps are popular because they are very simple in construction,and produce smooth, constant, （） discharge. ["non-pulsating","pulsating","positive","non-positive"]
下列关于国际借记卡特殊业务的描述错误的是（）。 ["书面挂失必须更换卡号","卡片失磁必须更换凭证","国际借记卡防伪换卡申请可在全行范围内办理","凭证更换后，有效期从凭证更换日起重新计算三年"]
什么是弯曲力？它分为哪两部分？
The emergency bilge suction or bilge （） is used to prevent flooding of the ship. ["injection valve","relief valve","discharge valve","inlet filter"]
贷记卡发卡环节的主要风险点有（）、信用卡交付、密码交付。 ["授信额度","审批手续","发卡标准","客户资料管理"]
普通冲裁制件的可分为哪几个区域？如何提高冲裁件的端面质量？
