负结存单价来源不包括（）。
A.手工录入
B.计划价
C.平均价
D.最新出库价
参考答案：C
Yesterday it rained heavily when school was over. We _______ stay in our classroom. [ ]
A. must
B. should
C. had to
D. need
色谱柱固定液为苯基（50％）甲基硅酮（OVl7），液相载荷量是（）％
A.1
B.2
C.3
D.5
