在药典中青黛靛玉红的含量测定采用
A．高效液相色谱法 B．气相色谱法 C．紫外-可见分光光度法D．酸碱滴定法 E．薄层扫描法
参考答案：E
There is a big bank near my home and it three years ago.
A．is built
B．are built
C．was built
D．is building
请画出图1蓝球所受的重力的示意图；请标出如图2所示通电螺线管的磁极.
