IEEE1394接口采用的6芯电缆中，有1根电源线，1根地线，2根差分时钟信号线和2

根据短文内容，判断下列句子正(T)误( F)。

      My name is Tingting. I'm twelve years old. I live in Hong Kong. My mother and father love me very

much. And I also love them. They bought me a piano. Because I like playing the piano.l want to be a piano

player someday. Playing the piano is very interesting. And you can learn something about music. A lot of

musicians and singers like playing the piano. I began to play the piano five years ago. To become a piano

player is a hard job. But I believe I can do it.

( ) 1. Tingting likes playing the piano.

(     ) 2. Tingting doesn't have a piano.

(     ) 3. Tingting wants to be a singer.

(     ) 4. To be a piano player is an easy job.

(     ) 5. Tingting began to play the piano at four years old.

刃磨麻花钻头的要求是什么？

具有收敛散风、杀真菌、止痒作用的外用剂型是：（）

A.溶液

B.粉剂

C.洗剂

D.酊剂

E.软膏

黄芪在补中益气汤中的配伍意义主要是

A．补气升阳

B．补气利水

C．益气生血

D．补气行血

E．补气摄血

混凝土所用的沙子宜采用什么沙？