和平共处的五项原则是什么?
参考答案:互相尊重主权和领土完整、互不侵犯、互不干涉内政、平等互利、和平共处。
I haven't seen Anna since she left our hometown two years ago, but we do keep in touch with each other
by sending emails ________.[ ]
A.here and there
B.sooner or later
C.at one time
D.now and then
溶血反应时出现黄疸和血红蛋白尿的机制是()
A.红细胞凝集成团,阻塞部分血管
B.凝集的红细胞发生溶解,大量血红蛋白释放入血浆
C.血红蛋白变成结晶体,阻塞肾小管
D.肾小管皮质缺血、缺氧而坏死脱落
E.红细胞破坏释放凝血物质引起DIC