瓦斯最主要的性质是燃烧性和爆炸性。（）
参考答案：对
I have ________ to show you. My father ______me a ”Harry Potter”.
A．new something, bought
B．something new, bought
C．nothing new, bought
D．anything new, bought
下列不属于血管造影并发症的是（）
A.穿刺部位血肿
B.假性动脉瘤
C.血管内膜剥离
D.原发病加重
E.血管破裂
