更换冲管之前需要做的准备错误的说法是()。
A.作业前现场做JSA
B.作业前开作业许可证
C.操作气绞车人员必须有操作证
D.泥浆泵无需挂牌.锁定
参考答案:D
An investor buys 200 shares of ABC at the market price of $100 on full margin. The initial margin requirement is 40 percent and the maintenance margin requirement is 25 percent. If the shares of stock later sold for $ 200 per share, what is the rate of return on the margin transaction()
A. 250%.
B. 100%.
C. 200%.
一青年男性,因胸闷气急入院,诊断为结核性胸膜炎。
结核性胸膜炎的胸腔积液常积滞于
A.胸腔内B.肋膈隐窝内C.肋纵隔隐窝内D.心包腔内E.纵隔内