血管介入性治疗主要包含哪些内容？
参考答案：血管介入性治疗主要包含：①血管栓塞术；②血管成形术；③血管內药物灌注治疗；④心脏血管病的介入性治疗等。
13. --- How long has he been in the army?
--- Oh, he joined the army as far ____ as 1997.
A．ago
B．away
C．from
D．Back
新加坡，随地吐痰、吐唾沫都要被罚款。（）
