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题目：
未知类型
A、可以降低成本
B、两个状态的系统具有稳定性
C、二进制的运算法则简单
D、上述三个原因
答案：
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Announcement from China ABC Tender Corporation Dear Sirs/Madam, In accordance with the Loan Agreement between Chinese Government and the Asian Development Bank (ADB) for "The Construction of a New Harbor Project in Shandong", China ABC Corporation Shandong Branch now invites bids from eligible suppliers from member countries of ADB for "the Construction of a New Harbor" in Shandong, to be financed with the proceeds of ADB. All those who are willing to participate in the bid are kindly requested to contact our office at 60 Yan'an Road, Qingdao, Shandong, tel86-532-6168217 , fax 86-532-6168218 to obtain bidding document between 9: 00 a.m．and 11: 00 a．m．(Sundays and holidays excepted)from Oct．25, 2008 to Dec．25, 2008 upon nonrefundable payment of RMB 500 while express mail postage RMB 50 shall be added. Bids shall reach ABC Corporation before 5: 00 a.m．Jan．1, 2009 (local time)．Bids will be opened in public at 10: 00 a.m．on Jan．18th, 2009(local time) in China ABC Corporation．Bids received after that date and time or not accompanied by a Bid Bond USD ＄1200 as required in the bidding document will not be accepted. Yours truly, Bids will be opened in Rm．A0408 at the address below: China ABC Corporation Shandong Branch Hui Bin Office Building, No．60 Yanan Road Qingdao, Shandong, China P．O．Box: 9802 Post code: 100101 Telex: 22655 CPCCI CN Tel: 4916649, 4916650 Fax: 4216612
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云体高大，底部阴暗，云顶呈园弧形重叠的云是：（）.
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（）接触面积大，能使头发有光泽和凝结度。
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