二尖瓣狭窄并有血栓栓塞时,约2/3的体循环栓塞为()
A.脑动脉栓塞
B.脾动脉栓塞
C.外周动脉栓塞
D.肾动脉栓塞
E.肺动脉栓塞
参考答案:A
下列的哪个程序段可能导致错误
A.String s = "hello";String t = "good";String k = s + t;
B.String s = "hello";String t;t = s[3] + "one";
C.String s = " hello ";String standard = s.toUpperCase( );
D.String s = "hello";String t = s + "good";
褶皱的基本形态可分为背斜和向斜。()