KEY-EL-EN

[判断题] 同时使用EN型和EL型风的非自动观测站，当EN型风日最大风速缺测时，可用EL型风相应记录代替。某时风向风速记录缺测时，如有EL型风记录，则用EL型风相应记录代替。即2分钟风向风速记录缺测时，用EL型风指示器（或轻便风向风速表）观测记录代替；若10分钟风向风速记录缺测时，用EL型风记录器挑取的该时次相应记录代替。（）A . 正确B . 错误

[填空题] 人工站（EL及EN型）：定时风，风速按（）后，小数位（）记录。当风速（）时，记“0.0”，风向记（）；自记风，当风速≤0.2m/s时，风速（），风向均记（）。

[填空题] 风传感器、EL型电接风、EN风仪有故障时，可用（）进行观测，若无上述仪器，可用目测风向风速。

[单选题]Acandidate key is().A．an attribute or a set of attributes with a unique value for each tuple of a relationB．a set of attributes referring to another relation in the databaseC．an attribute or a set of attributes that is potentially the primary key of

[名词解释] EL机构

[单选题]The key benefit of ( )is that it provides guidance and direction on how the project costs will be managed throughout the project.A．Plan Cost ManagementB．Control CostC．Estimate CostD．Determine Budget

[单选题]For relation where primary key contains multiple attributes， no non-key att

[单选题]The key word in Paragraph 4 is ______.A． barriersB． ignoranceC． disabilityD． prejudice

[单选题]There are a number of key technologies that will enable LTE Advanced to achieve the high data （ ） rates that are required．（ ） are two of the base technologies that will be enablers．Along with these there a number of other techniques and technologies

[填空题] key君是谁？（）