As for object capture, the following statement is wrong: A: The more feature points an object snap sets, the better. B: Press F3 on the keyboard to start object snapping. C: With the tangent snap in the object snap, you can draw the common tangent of two circles. D: To snap to a drawn point object, turn on snap nodes.

In the vector field, the vector line is such a curve where ( ) A: The tangent direction at each point on it is orthogonal to the direction of the vector field at that point. B: The tangent direction at each point on it is parallel to the direction of the vector field at that point. C: The value of each point on it is equal to the value of the vector field at that point. D: The vector line is the geometric curve of the vector field function.

A nation maximizes satisfaction by reaching the highest possible indifference curve， and in the absence of trade will produce where its production possibilities schedule is tangent to an indifference curve.（ ）

当我们要捕捉两图形的交点时,应使用何种目标捕捉模式? A: ENDpoint B: MIDpoint C: INTersection D: TANgent

What is the reason for undercutting in the generating method of gear machining? A: The addendum line of the rack cutter is higher than the tangent point B: Too many teeth C: Too little teeth D: None of the above

对于倒圆角操作(),( )操作能够让系统选择--相切到选择棱边的一-系列棱边? A: Add Tangent Edges B: Blend All Instance C: Overflow Option D: Point Method

选择下列哪一项，可以在进行选择操作时只选一个边缘而选中所有相切边缘（） A: 自动选择（Auto Select） B: 选择所有的边（Select All Edges） C: 增加相切链（Add Tangent Chain） D: 增加体的边缘（Add Edges of Body）

磁场中某点的磁感应强度的方向（ ）Direction of magnetic flux density at a point is ( ) A: 放在该点的通电直导线所受的磁场力的方向The direction of the magnetic force on the current-carrying placed at this point B: 放在该点的正检验电荷所受的磁场力的方向The direction of the magnetic force on the positive charge placed at this point C: 放在该点的小磁针静止时N极所指的方向The direction of N pole when the small magnetic needle placed at this point is stationary D: 通过该点磁场线的切线方向Tangent direction of magnetic field line at this point