主-骼动脉慢性闭塞粥样病变经皮血管腔内成形术(PTA)近期成功率可达90%~95%,三年通畅率为()。
A.90%
B.80%
C.70%
D.60%
E.50%
参考答案:D
The mobile phone has influenced people's life a lot since it __________.
A.invents
B.invented
C.is invented
D.was invented
我国法定计量单位中,长度的基本单位的单位符号是
A.mmB.kmC.mD.umE.nm