过椭圆x22+y2=1的左焦点F作斜率为k（k≠0）的直线交椭圆于A，B两点，使

泌尿系结石病人主要的症状是（）

A.疼痛和血尿

B.尿频和尿痛

C.排尿困难

D.无痛性血尿

E.脓尿和血尿

Earl has been employed by Flash Co, for the past 20 years. During that time he has also invested in the company in the form of shares and debentures. Earl owns 5,000 ordinary shares in Flash Co. The shares are of $1 nominal value and are paid up to the extent of 75%. The debentures, to the value of $5,000, are secured by a fixed charge against the land on which Flash Co’s factory is built. In April it was announced that Flash Co was going into immediate insolvent liquidation, owing considerable amounts of money to trade creditors (trade payables). As a result of the suddenness of the decision to liquidate the company, none of the employees received their last month’s wages. In Earl’s case this amounted to $2,000. Required: Advise Earl as to his rights and liabilities in relation to Flash Co in regard to:

(b) his shareholding; (3 marks)

某患者轻度肥胖，空腹血糖5.6mmol/L，口服葡萄糖75g后30分钟血糖达高峰，为11.1mmol/L，2小时为6.7mmol/L，3小时为4.6mmol/L。其血浆胰岛素浓度及变化可能是（）

A.空腹时<5μIU/ml

B.空腹时100μIU/ml（正常5~24μIU/ml）

C.空腹时正常，口服葡萄糖后缓慢升高，持续时间延长，以后下降

D.空腹时正常，口服葡萄糖后迅速升高，持续时间长，以后下降

E.空腹时正常，口服葡萄糖后迅速升高，然后逐渐下降

超声波流量计的工作原理是在管道的一侧或者两侧嵌置两个能发射和接收声脉冲的探头，互相发射和接收对方的声脉冲。两个探头便构成了（）。其中，沿顺流方向的声道传播的声脉冲的声速因叠加一个气流速度分量而增大，反之则声速减少，这样便形成了顺流方向与逆流方向传播的时间差

A、声道

B、连接

C、声脉冲

D、时间差

钢筋混凝土构件图中，代号@、Φ有以下含义（）

A、@是表示钢筋等距排列符号

B、@是钢筋类别符号

C、Φ是钢筋类别和直径符号

D、Φ钢筋等距排列符号

E、Φ是钢筋编号符号