投资者融资买入证券或融券卖出时,其融资融券保证金比例不得低于30%。()
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It can be inferred from the text that the biggest losers are those who
A. jump off the sinking ship while sailing on the sea.
B. drown in the water in the same way as the others.
C. make mistakes in spite of the awareness of danger.
D. keep the stocks when their value approaches zero.
肾素释放的原因是()。
A. 血清钾浓度降低
B. 血容量增多
C. 动脉血压升高
D. 交感神经兴奋
E. 血清Na+浓度升高
被誉为现代经济法和竞争法产生的标志的是《威尔逊法》。()
滥用独占地位限制竞争的行为的主体是公用企业或者具有具有独占地位的经营者。()