为延长血液的保存时间,在ACD保存液加入的物质是 ()
A.肌苷
B.次黄嘌呤
C.腺嘌呤
D.铵
E.磷酸盐
参考答案:C
Bob is good ________ music.He can be good ________ children in the music club.
A.at, at
B.with, with
C.at, with
D.with, at
在HTML语言中,下列关于文本对齐方式的源代码设置,不正确的一项是( )。
A.居中对齐:<div align="middle">…</div>B.居右对齐:<div align="right">…</div>C.居左对齐:<div align="left">…</div>D.两端对齐;<div align="justify">…</div>