They have relatives on the _____________.
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On the contrary, China is a _____________ in the modern international society.
The teacher wrote on the __________ with a piece of chalk.
画放大电路直流通路时，电容应视为。
A. 短路
B. 开路
C. 不变
按采购主体分类,采购可分为()
A. 国内采购和国外采购
B. 政府采购、企业采购和个人采购
C. 有形采购和无形采购
D. 长期合同采购和短期合同采购
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