物流整体结构包括（）
A.生产物流
B.销售物流
C.供应物流
D.储存物流
E.回收、废弃物流
参考答案：A, B, C
用动词的适当形式填空.
1. My mother _____ ( clean) our house yesterday afternoon .
2. My friend _____ ( say) goodbye to me and went out.
3. —_____ ( be) your children at home last night?
—Yes, they _____.
4. —What _____ Jeff _____ (do) last night?
—He _____ (watch) TV.
5. —How _____ ( be) your last weekend?
—It _____ (be) exciting.
6kV电动机若要装设三相纵差保护，必须要有6只电流互感器。（）
