用酸性染料比色法测定硫酸阿托品片的含量,选择的酸性染料为
A.溴麝香草酚蓝
B.溴甲基酚绿
C.酚酞
D.结晶紫
E.甲基红
参考答案:B
阅读理解,根据短文内容判断句子的正(T)误(F)。
I'm 15 years old. I'm of medium height and have short hair. My hair
isn't blonde, it's blue. My dad thinks it's strange (奇怪的), but my friends
think it's great. I wear glasses with bright, red frames (边框). And I have
earring(耳环) on one ear. It's so cool! But Dad doesn't like it! I like big
pants and long T-shirts. Many of my T - shirts have pictures of my favorite
rock bands on the front.
( )1. The boy has long hair.
( )2. The father likes his son's earring.
( )3. The boy's friends like his blue hair.
( )4. The boy likes big pants and long T-shirts.
( )5. The boy doesn't like rock bands.
下面叙述中,正确的是
A.数据库系统是一个独立的系统,不需要操作系统的支持
B.数据库设计是指一个独立的系统,不要操作系统的支持
C.数据库技术的根本目标是要解决数据共享的问题
D.数据库系统中,数据的物理结构必须与逻辑结构一致