下列哪项属于血管介入（）.
A.冠脉搭桥术
B.脾动脉栓塞术
C.经皮腰穿刺
D.PTCD
E.经皮椎间盘切吸术
参考答案：B
矿岩的强度中，（）强度最大。
A．抗拉
B．抗弯
C．抗压
A Class A EPIRB is NOT（）.
A.approved by the CCS
B.designed for float free，automatic activation
C.operated on 121.5/243 MHz
D.operated manually
