下肢深静脉内延续性血栓的头部为（）
A．透明血栓
B．白色血栓
C．混合性血栓
D．红色血栓
E．延续血栓
参考答案：B
Everything was perfect for the picnic the weather．
A．in place of
B．as well as
C．except for
D．in case of
金属在干燥条件或理想环境中不会发生腐蚀。
