中国水仙的球根按大小分类，传统的单位是（）。
A.装
B.厘米
C.周径
D.20装
参考答案：A
— ________ ?
—I’ll have a hot dog, please.
A．Would you like some more
B．I’ll take your order, OK
C．What do you like
D．Hi, have you ordered yet
浅层X射线的能量范围是（）
A.10-60KV
B.60-160KV
C.180-400KV
D.400KV-1MV
E.2-50MV
