小学儿童的身心发展的特征有()。
A.兴奋与抑制过程逐步趋向平衡
B.游戏在生活中所占的比重大
C.书面语言和内部语言发展迅速
D.情绪、情感比较外露
参考答案:A, C, D
Assume a firm with a debt to equity ratio of 0.50 and debt equal to $ 35 million makes a commitment to acquire raw materials with a present value of $12 million over the next 3 years. For purposes of analysis the best estimate of the debt to equity ratio should be :()
A. 0.343.
B. 0.500.
C. 0.671.
触媒堆比重一般小于该触媒的密度。