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【单选题】
交通运输条件、能源供应、设施和商业设施；广告、销售渠道、银行和信贷机构等商业设施。这些设施越发达，国际企业就越能顺利地在目标国开展投资、生产和销售活动。这些国家所必备的条件应该是一个国家的（ ）。A.
自然地理环境
B.
基础设施
C.
社会人文环境
D.
产业设施
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皮皮学刷刷变学霸
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【单选题】听力原文： In the early 180Os, the paper industry was still using rags as its basic source of fiber as it had for many centuries. However, the rag supply couldn't keep up with the growing demand for paper....
A.
wood pulp was of good quality
B.
wood pulp was very cheap
C.
rags were not enough
D.
rags could not be obtained in the U. S.
【简答题】35 六级精度以上的孔加工应用 方法加工,七级精度的轴加工可用 方法加工。
【简答题】35 六级精度以上的孔加工应用 方法加工,七级精度的轴加工可用 方法加工。
【单选题】听力原文： In the early 180Os, the paper industry was still using rags as its basic source of fiber just as it had for many centuries. However, the rag supply couldn't keep up with the growing demand for p...
A.
Publishers wanted higher quality paper.
B.
Paper made from rags deteriorated too quickly.
C.
Wood pulp had become too expensive.
D.
The supply of rags was insufficient.
【单选题】Using source transformation, the current in the circuit is:
A.
4.5∠
B.
9∠
C.
4.5∠
D.
9∠
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