I can't get there; there is _____ bus. [ ]
A. not
B. no
C. no a
D. no one
答案:B
Mahmoud Abbas’s victory was expected.
α-丁酸萘酚酯酶(α-NBE)染色时所需的pH要求为()
A.酸性
B.弱酸性
C.中性
D.弱碱性
E.碱性