骨与关节结核在哪种情况下,适宜做病灶清除手术
A.不能自行吸收的脓肿
B.长期不愈的窦道
C.有脊髓神经压迫症状
D.不易控制的单纯滑膜结核
E.合并肾结核
参考答案:A,B,C,D
David’s effort was ______, because he won the first prize in the English speech contest, _____ made his classmates surprised.
A.paid off; which
B.paid back; it
C.paid for; that
D.paid up; he
区别D-型和L-型甾体皂甙用
A.三氯乙酸反应B.Molish反应C.中性乙酸铅试剂D.IR光谱E.吉拉尔(Girard)试剂