医药产品对()规定较为严格。
A.性能指标
B.寿命指标
C.可靠性指标
D.安全性指标
参考答案:B
You have made a few mistakes in your composition but _______ you have done well.
A.on the whole
B.first of all
C.on the other hand
D.in a word
为什么人们购买债券和股票从个人来说可算是投资,但在经济学上不算是投资?