在到货计划流程的到货环节，可以完成的操作有（）
A、预建档
B、建立进货台帐
C、加封
D、装箱
参考答案：A, B
It is said that many kids are worried about the year 2012, ________, they think the earth will be
destroyed by disasters.[ ]
A. when
B. where
C. as
D. which
角膜软化症早期的临床表现为()
A．前房积脓
B．夜盲
C．皮肤干燥粗糙
D．角膜混浊
E．结膜干燥
