可使紫花洋地黄苷A水解得到次生苷和葡萄糖的条件是()
A.3%~5%H2SO4
B.0.02~0.05mol/L HCl
C.NaHCO3溶液
D.紫花苷酶
E.麦芽糖酶
参考答案:D
_____ tallest student in the swimming club is _____ boy called Dale.
A.The, a
B.A, the
C.A, the
D.An, an
下述哪种骨肿瘤肯定不是原发骨肿瘤()
A.癌
B.血管瘤
C.巨细胞瘤
D.纤维瘤
E.肉瘤