欲将含有盐酸的氯化钙溶液调至中性,得到氯化钙溶液,在没有指示剂的情况下,应加入的试剂是[ ]
A.Na2CO3
B.CaO
C.Ca(OH)2
D.CaCO3
答案:D
_____ children believe they can succeed, they will never become totally independent. [ ]
A. If
B. Though
C. Unless
D. When
头孢曲松又称
A.新达罗B.西力欣C.罗氏芬D.复达欣E.头孢唑啉