什么是弹性元件的弹性后效，弹性滞后？对弹簧管压力表的示值有何影响？
查看答案
放样点位的距离交会法是根据（）来放样的。
A. 一个角度和一段距离
B. 两个角度
C. 两段距离
D. 两个坐标差
For a floating vessel,the center of the floating is the point in the waterpiane.（）.
A. aboat which the vessel lists and trims
B. which coincides with the center of buoyancy
C. which, in the absence of external forces, is always vertically aligned with the center of gravity
D. which is shown in the hydrostatic tables as VCB
登录网银后，个人用户如发起对他人转账，投资服务开通等重要交易时需输入动态口令进行身份验证（）
A. 正确
B. 错误
微信支付 
支付宝支付