不能实现留置权的合同是( )。
A．运输合同
B．抵押合同
C．保管合同
D．加工承揽合同
参考答案：B
硝酸甘油抗心绞痛主要的机制是扩张冠状动脉，扩张静脉降低前负荷。
When my parents told me they were getting separated. I couldn’t believe our family was going to . .
A．break down
B．break away
C．break up
D．break out
