下列氨基酸中,属于尿素合成中间产物的是()。
A.甘氨酸
B.色氨酸
C.赖氨酸
D.瓜氨酸
参考答案:D
In HDLC protocol , when supervisory frame's type code is '11'. About the following Statements, which is correct ( )
A.receive ready
B.receive not ready
C.reject
D.selective reject
复合IC卡内电子现金账户已激活,做结清时如选择“刷磁条”,系统会自动识别卡号为非纯磁条卡,拒绝结清。()