下列说法正确的是（ ） A．2HI500℃.H2+I2和H2+I2600℃.2H

为控制选择偏倚，可以将研究对象随机分配到各处理组中。这种随机化的方法可以用于下列哪些研究（）

A.队列研究

B.病例对照研究

C.现况研究

D.临床试验研究

E.现场试验研究

Required:

(b) Jocatt operates in the energy industry and undertakes complex natural gas trading arrangements, which involve exchanges in resources with other companies in the industry. Jocatt is entering into a long-term contract for the supply of gas and is raising a loan on the strength of this contract. The proceeds of the loan are to be received over the year to 30 November 2011 and are to be repaid over four years to 30 November 2015. Jocatt wishes to report the proceeds as operating cash flow because it is related to a long-term purchase contract. The directors of Jocatt receive extra income if the operating cash flow exceeds a predetermined target for the year and feel that the indirect method is more useful and informative to users of financial statements than the direct method.(i) Comment on the directors’ view that the indirect method of preparing statements of cash flow is more useful and informative to users than the direct method. (7 marks)(ii) Discuss the reasons why the directors may wish to report the loan proceeds as an operating cash flow rather than a financing cash flow and whether there are any ethical implications of adopting this treatment. (6 marks)Professional marks will be awarded in part (b) for the clarity and quality of discussion. (2 marks)

引起服务中心当班人员营业款差错的常见原因包括（）等。

A.操作窗口共用

B.登录密码共用

C.操作电脑共用

下列哪项属于血管介入（）

A.冠脉搭桥术

B.脾动脉栓塞术

C.经皮腰穿刺

D.PTCD

E.经皮椎间盘切吸术

钢坯的头尾温差是由（）造成的。

A.钢坯长度

B.炉子宽度

C.烧嘴火焰

D.炉子长度