She likes volleyball, _____ she doesn't like playing it. [ ]
A. but
B. or
C. and
答案:A
有助于尿路恶性肿瘤诊断的指标是 ()
A.尿溶菌酶
B.尿N-乙酰-β-D-葡萄糖苷酶
C.尿γ-谷氨酰转肽酶
D.尿碱性磷酸酶
E.尿乳酸脱氢酶
VBA中定义符号常量的关键字是【 】。