低碳钢试件在拉伸过程中,应力应变曲线变化分为以下几个阶段。()
A、比例阶段
B、颈缩阶段
C、屈服阶段
D、强化阶段
E、破坏阶段
参考答案:A, B, C, D
Verification of compliance with the Global Investment Performance Standards ():()
A. may be performed on a single composite.
B. is required for a firm to claimcompliance.
C. requires the verification report to be issued for the entire firm.
在地形图上确定某点高程依据是()。
A.图上比例尺
B.平面坐标值
C.图上等高线
D.水平距离