13C-NMR扣，C-3的信号在δ43左右的是( )
A．二氢黄酮B．二氢黄酮醇C．黄酮醇D．异黄酮E．黄酮
参考答案：A
—Look ______ the two children, they're Nick and Lily.
—Oh, they're twin ______. [ ]
A. at; brother and sister
B. /; brothers
C. of; sisters
D. after; boys
患者有可能患的疾病是
A．腹主动脉瘤
B．肾动脉狭窄
C．嗜铬细胞瘤
D．原发性高血压
E．门静脉高压
