排泄最慢作用最持久的强心苷是；
A．毛花苷丙B．铃兰毒苷C．洋地黄毒苷D．地高辛E．毒毛花苷K
参考答案：C
China is one of the developing countries that the third world.
A．belong to
B．belongs to
C．is belonged to
D．are belonged to
在含油气盆地构造单元的划分中一级构造单元的划分是（）和（）.
