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【单选题】
数据库概念设计的E-R模型关系中,用属性描述实体的特征,属性在E-R图中,用( )表示。
A.
矩形
B.
四边形
C.
菱形
D.
椭圆形
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参考答案:
举一反三
【单选题】The water flows from the water jacket to the radiator through .
A.
rubber hoses
B.
metal tunnels
C.
fan belts
D.
water pump
【单选题】如船无风无流时船速为10节,现顺风顺流各2节,则电磁计程仪显示的航速应为 ;多普勒计程仪显示的对地航速应为 。
A.
10节;12节
B.
12节;14节
C.
14节;12节
D.
10节;14节
【单选题】Coolant in a liquid-cooled system flows directly from the water pump to the _____.
A.
water jackets and passage
B.
top of the radiator
C.
cylinder head
D.
bottom of the radiator
【单选题】检索词的匹配操作练习,利用手机或电脑,打开中国知网(www.cnki.net),在主页上方的检索框中输入“中草药萃取”,点击 ,浏览检索结果,检索结果是字面匹配还是智能语义匹配?( )
A.
字面匹配
B.
智能语义匹配
【简答题】Fill in the blanks based on the attached video-clip about a brief introduction to boilers in thermal power plant. 1. Burners in the boiler convert the chemical energy in the ___________ into thermal e...
【多选题】工程建设项目具有一般项目的基本特征,具体表现在()。
A.
工程建设项目的一次性
B.
工程建设项目的约束性
C.
工程建设项目的目标性
D.
工程建设项目的建设周期长
E.
工程建设项目的投资大
【单选题】Water flows from the
A.
lower water potential to the higher water potential
B.
higher water potential to the lower water potential.
C.
Lower ψ s to the higher ψ s
D.
Higher ψ s to the lower ψ s
【单选题】如船无风无流时船速为10节,现顺风顺流各2节,则电磁计程仪显示的航为;多普勒计程仪显示的对地航速应为。
A.
10 节, 12 节
B.
12 节, 14 节
C.
14 节, 12 节
D.
10 节, 14 节
【单选题】Water flows from points 1 to 2. If the water velocity at point 1 is negligible, frictional losses are essentially zero, and there are no entrance/exit effects in the tank and pipe, how is the pressure...
A.
P1 = P2
B.
P1 > P2
C.
P1 < P2
D.
not enough information
【简答题】Fill in the blanks based on the attached video-clip about a brief introduction to boilers in thermal power plant. 爱剪辑-steam boiler2.mp4 1. Burners in the boiler convert the chemical energy in the ____...
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