下列坐标图象能够准确地反映出各物理量之间的关系的是：（ ） A． 研究密度

阅读短文，判断正(√)误(×)。

      Lily is a student of No. 16 Middle School. She's good at English. Her teacher likes her very much. She

often lets her show the visitors around. Lily likes doing that. She often introduces the class building, the library,

the computer room and the music club to them. She likes her school a lot.

( ) 1. Lily is a teacher.

( ) 2. Lily enjoys speaking English.

( ) 3. Lily doesn't like show the visitors around.

( ) 4. She often introduces the dance room.

地下河

●D/A变换器的主要技术指标包括分辨率、精度、变换时间和动态范围，其中分辨率表示D/A变换器的1LSB输入所对应的输出变化的程度。对于12位的D/A变换器而言，当D/A变换器的输入变化1LSB时，其输出将变化满刻度值的（）。

A.1/256

B.1/512

C.1/1024

D.1/4096

铁细菌一般能生活在含氧多但溶有较少铁质和二氧化碳的水中。（）

具有发汗解表、行气宽中功效的药物是（）

A.羌活

B.紫苏

C.细辛

D.桂枝

E.生姜