物体的正投影特性是绘制三视图的依据。 We can get three views of solid based on the feature of orthographic methods.
物体的正投影特性是绘制三视图的依据。 We can get three views of solid based on the feature of orthographic methods.
参考答案和解析
正确
相关考题：
正投影图是() A.用平行投影的正投影法绘制的单面投影图B.用中心投影法绘制的单面投影图C.用平行投影的正投影法绘制的多面投影图D.是在物体的水平投影上加注某些特征面、线以及控制点的高度数值的单面正投影
The RECYCLEBIN parameter is set to ON for your database. You drop a table, PRODUCTS, from the SCOTT schema.Which two statements are true regarding the outcome of this action?() A. All the related indexes and views are automatically droppedB. The flashback drop feature can recover only the table structureC. Only the related indexes are dropped whereas views are invalidatedD. The flashback drop feature can recover both the table structure and its data
According to the last paragraph, the fourth way is "of a different kind" because（ ）[A] the first three ways can increase the water supply, while the fourth one can't[B] the first three ways can make a better use of water, while the fourth one can't[C] the first three ways is technology-based, while the fourth one is market-based[D] the first three ways can't balance the supply and demand of water, while the fourth one can
Which two statements are correct regarding the Flashback Versions Query feature？（）A、 You can use this feature to identify the committed versions of the rows， but not the uncommitted versions.B、 You can use this feature to identify the versions of V$ views.C、 You can use this feature to identify the inserts， deletes， and updates performed on a particular row but not the data definition language （DDL） operations performed on the table.D、 You can use this feature for a table only if row movement is enabled for the table.E、 You can use this feature to identify the versions of external and fixed tables.
The RECYCLEBIN parameter is set to ON for your database. You drop a table，PRODUCTS，from the SCOTT schema. Which two statements are true regarding the outcome of this action？（）A、 All the related indexes and views are automatically droppedB、 The flashback drop feature can recover only the table structureC、 Only the related indexes are dropped whereas views are invalidatedD、 The flashback drop feature can recover both the table structure and its data
which one of the following best describes the use of hidden column formula?（）A、views can be hidden based on a formula B、hidden columns are not a supported feature C、table columns can be hidden based on a formula D、view columns can be displayed or hidden based on a formula
单选题which one of the following best describes the use of hidden column formula?（）Aviews can be hidden based on a formula Bhidden columns are not a supported feature Ctable columns can be hidden based on a formula Dview columns can be displayed or hidden based on a formula
单选题We’ll never get to the station on time _____ we run as fast as we can.Ain caseBeven ifCprovided thatDif only
问答题Most people would describe water like a colorless liquid. They (1) _______would know that in very cold conditions it becomes a solid calledice and that when heating on a fire it becomes a vapor called steam. (2) _______However, water, they would say, is a liquid. We have learned thatwater consists of molecules composed with two atoms of hydrogen (3) _______and one atom of oxygen, which we describe by the formula H2O.This is equally true of the solid called ice and the gas called steam.Chemically there is no difference between the gas, the liquid, andthe solid, all of which is made up of molecules with the formula H2O. (4) _______This is true of other chemical substances; most of them can exist asgases or as liquids or as solids. We may normally think of iron as asolid, but if we will heat it in a furnace, it will melt and become a (5) _______liquid, and at very high temperatures it will become a gas. Nothingvery permanent occurs when a gas changes into a liquid or a solid.Everyone knows that ice, which has been made by freezing water,can be melted again by warmed and that steam can be condensed (6) _______on a cold surface to become liquid water. In fact, it is only becausewater is so a familiar substance that different names are used for (7) _______the solid, liquid and gas. Most substances are only familiar with (8) _______us in one state, because the temperatures requiring to turn them (9) _______into gases are very high, or the temperatures necessary to turn theminto solids are so low. Water is an exception in this respect, whichis another reason why its three states have given three different (10) _______names.
多选题The RECYCLEBIN parameter is set to ON for your database. You drop a table，PRODUCTS，from the SCOTT schema. Which two statements are true regarding the outcome of this action？（）AAll the related indexes and views are automatically droppedBThe flashback drop feature can recover only the table structureCOnly the related indexes are dropped whereas views are invalidatedDThe flashback drop feature can recover both the table structure and its data
单选题正投影图是（）A用中心投影法绘制的单面投影图B用平行投影的正投影法绘制的多面投影图C用平行投影的正投影法绘制的单面投影图D是在物体的水平投影上加注某些特征面、线以及控制点的高度数值的单面正投影
单选题We'll do what we can to get the goods____on time, said the manager of the company.AreachedBdeliveredCreturnedDcome
多选题What are three features of the Cisco IOS Firewall feature set？（）Anetwork-based application recognition （NBAR）Bauthentication proxyCstateful packet filteringDAAA servicesEproxy serverFIPS
单选题Which tuning tool recommends how to optimize materialized views so that these views can take advantage of the general query rewrite feature?（）ASegment AdvisorBSQL Access AdvisorCUndo AdvisorDSQL Tuning Advisor
单选题Which tuning tool recommends how to optimize materialized views so that these views can take advantage of the general query rewrite feature？（）A Segment AdvisorB SQL Access AdvisorC Undo AdvisorD SQL Tuning Advisor