在CRH1A型动车组中，仅（）有主机应用软件。
A.TDSCCU
B.AXSCCU
C.ATPCCU
D.TCCCU
参考答案：D
He asked__________for a violin.
A．did I pay how much
B．I paid how much
C．how much did I pay
D．how much I paid
（12分）写出下列元素的名称或符号：
