目前钢制储罐焊接方法中应用最广泛的一种是( )。
A．手工电弧焊接
B．双丝埋弧自动焊接
C．钢制储罐立缝气电焊
D．磁性角焊缝埋弧焊
参考答案：A
Which of the following would provide evidence against the semi-p form of the efficient market theory（）
A. Low P/E stocks tend to have positive abnormal returns over the long run.
B. Trend analysis is worthless in determining stock prices.
C. All investors have learned to exploit signals related to future performance.
M蛋白是
A．系统性红斑狼疮患者的特异性蛋白B．类风湿关节炎患者的特异性蛋白C．慢性粒细胞白血病患者的特异性蛋白D．多发性骨髓瘤患者的特异性蛋白E．前列腺癌的特异性蛋白
