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【简答题】
某液体在套管环隙内流动,大管规格为 φ56×3mm ,小管规格为 φ30×2.5mm, 液体粘度为 1mN*s*m - 2 ,密度为 1000kg/m 3 ,流速为 1m/s ,则该液体在套管环隙内流动的 Re=( ) 。
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举一反三
【单选题】网络安全的主要目标是通过各种技术与管理等手段,实现网络信息的保密性、完整性、可用性、可控性和可审查性(网络信息安全5大特征)。下面哪些是网络安全的基本要求?
A.
可用性
B.
可控性
C.
可审查性
D.
不可抵赖性
【单选题】The expiry date of a documentary credit is Sunday, 24 February, and documents have to be a presented to you. Which of the following is an acceptable presentation? (Assume there is no latest stated dat...
A.
Presentation to you on Monday 25 February with the bill of lading dated 25 February.
B.
Presentation on Tuesday 26 February with the bill of lading dated Sunday 24 February.
C.
Presentation on Monday 25 February with the bill of lading dated Sunday 24 February.
D.
Presentation on Friday 22 February with the bill of lading dated Sunday 29 January.
【简答题】互联网信息安全的基本特征是保密性、完整性、真实性、可用性、可审查性、( )。
【简答题】简述中华民族优良道德传统
【单选题】Checks are run to ensure that the expiry date, date and place for presentation of documents and the latest date for shipment are all ___________.
A.
accepted
B.
accepting
C.
to accept
D.
acceptable
【简答题】Translate the sentences. Key words and phrases are in brackets. It seems that the contract has passed the expiry date. (有效期)
【判断题】According to Article 43 of UCP600, when the shipment date and the expiry date of L/C are Aug.30 and Sep.15 respectively, the beneficiary may present the documents between Sep.16 and 20 because these d...
A.
正确
B.
错误
【单选题】Deadline for presentation under the letter of credit is not later than ( ) calendar days after the date of shipment and not later than the expiry date of the credit.
A.
21
B.
11
C.
31
D.
25
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