投资者通过购买有价证券以使其增值的投资行为是()
A、企事业单位投资
B、个人投资
C、经济性投资
D、金融性投资
参考答案:D
代表药物安全性的指标是()
A.治疗指数
B.半数有效量
C.半数致死量
D.最小致死量
E.极量
Speaker A: It took me ten years to build up my business, and it almost killed me.
Speaker B: Well, you know what they say: ().
A. There is no smoke without fire.
B. Practice makes perfect.
C. All roads lead to Rome.
D. No pains, no gains.