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【简答题】
已知A(1,-2,3),B(1,1,4),C(2,0,2),则向量AB与向量AC的数量积是 向量积是 ;
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举一反三
【单选题】17 Increasing resources on the critical path activities may not always shorten the length of the project because:
A.
Certain activities are time-dependent rather than resource-dependent (i.e., using three ovens rather than one to bake a cake).
B.
Safety, OSHA and EPA may have placed restrictions on the number of people used on certain activities or in the physical location of the project.
C.
The skill level of the added resources might not be appropriate for the activities to be performed.
D.
Adding more resources may create additional work and produce inefficiencies (i.e., additional people may need training and supervision.)
E.
All of the above
【单选题】Increasing resources on the critical path activities may not always shorten the length of the project because:
A.
Certain activities are time-dependent rather than resource-dependent (i.e., using three ovens rather than one to bake a cake).
B.
Safety, OSHA and EPA may have placed restrictions on the number of people used on certain activities or in the physical location of the project.
C.
The skill level of the added resources might not be appropriate for the activities to be performed.
D.
Adding more resources may create additional work and produce inefficiencies (i.e., additional people may need training and supervision.)
E.
All of the above.
【单选题】飞机的登机门通常分为主登机门和服务门
A.
主登机门在机身的左侧，服务门在机身的右侧
B.
主登机门在机身的右侧，服务门在机身的左侧
C.
在紧急情况下主登机门可以当应急出口，服务门不行
D.
在紧急情况下服务门可以当应急出口，主登机门不行
【单选题】Britain has always been fortunate in having plentiful energy resources. At the end of the eighteenth century these were principally coal and, in places water power from swift-flowing streams and river...
A.
rich energy resources
B.
water power
C.
the declining rural economy
D.
cheap labor
【单选题】135 Increasing resources on the critical path activities may not always shorten the length of the project because:
A.
Certain activities are time-dependent rather than resource-dependent (i.e., using three ovens rather than one to bake a cake).
B.
Safety, OSHA and EPA may have placed restrictions on the number of people used on certain activities or in the physical location of the project.
C.
The skill level of the added resources might not be appropriate for the activities to be performed.
D.
Adding more resources may create additional work and produce inefficiencies (i.e., additional people may need training and supervision.)
E.
All of the above
【简答题】A．They are always made of stone. B．They are painted in bright colors. C．They contain moving parts. D．They make use of holes.
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