可用被动免疫紧急预防
A．柯萨奇病毒B．埃可病毒C．脊髓灰质炎病毒D．肠道病毒72型E．肠道病毒70型
参考答案：C
若两个相似三角形的相似比为1：4，则它们的面积之比为 [ ]
A．1：2
B．1：4
C．1：5
D．1：16
Which of the following statement about market is FALSE（）
A. Over-the-counter-market is called a continuous market.
B. Dealer-markets are price driven markets.
C. If trades occur at any time the market is open, it is called continuous market.
