硬骨鱼类的鳃间隔除少数种类外,一般都较发达。
A. 正确
B. 错误
If the president wants to put a treaty into effect, he has to get the approval by two thirds of the ()
A. Senate
B. Cabinet
Congre
β受体阻滞剂映<副作用有()
A. 体位性低血压、头晕、疲乏
B. 水肿、心衰、低血糖
C. 乏力、恶心、呕吐
D. 腹泻、支气管哮喘
E. 抑郁、睡眠紊乱
()是指境内投资主体根据直接投资企业的合同或章程规定实际缴付的出资额。
A. 协议投资额
B. 实际投资额
C. 反向投资额
D. 股本投资