电动弯管机弯管时，所用的附件有（）。
A.动胎轮
B.导向模
C.定胎轮
D.压紧模
参考答案：B, D
The computer center, ________ last year, is very popular among the students in this school.
A．open
B．opening
C．have opened
D．opened
善于活血行气止痛的药物是（）
A.延胡索
B.陈皮
C.香附
D.木香
E.丹参
