椒艾汤功效与作用

下列哪项检查对诊断有意义

A．血沉

B．血清补体检测

C．血清抗心磷脂抗体测定

D．胸部CT

E．24h尿蛋白测定

某同学设计了测定空气中氧气含量的实验，实验装置如图．该同学的实验步骤如下：①将图中的集气瓶分为5等份，并作好标记．

②在带橡皮塞和导管的燃烧匙内装入足量的红磷，将导管上的止水夹夹紧，在酒精灯上点燃红磷，并立即伸入集气瓶内，塞紧橡皮塞．

③充分反应后，待集气瓶冷却至室温，打开止水夹．请回答下列问题

（1）该实验中红磷需稍过量，目的是 _                                         ________ ．

（2）步骤③中打开止水夹后观察到的现象是 ____                          _____ ，由此可得出空气中氧气的体积分数约为 __            _______ ．

（3）该实验可推论出氮气 ______              ___ （填“易”或“难”）溶于水和其化学性质 _________ （填“活泼”或“不活泼”）的结论．

蒙古国一批牛奶制品经过中国关境时存入中国海关监管的仓库，后出口转运到日本，该批货物属于直接过境贸易。( )

Sid is a director of two listed public companies in which he has substantial shareholdings: Trend Co and Umber Co.The annual reports of both Trend Co and Umber Co have just been drawn up although not yet disclosed. They show that, Trend Co has made a surprisingly big loss and that Umber Co has made an equally surprising big profit. On the basis of this information Sid sold his shares in Trend Co and bought shares in Umber Co. He also advised his brother to buy shares in Umber Co.Vic who is also a shareholder in both companies sold a significant number of shares in Umber Co only the day before its annual report was published.Required:

(b) In particular advise Vic as to his position. (2 marks)

当物体不是均质物体时，重心和几何中心是否重合（）。

A.不一定重合

B.一定重合

C.一定不重合

D./