名片设计的基本要求不包括（)。A．信息要简明清楚，构图完整明确B．注意质量、功效，

Because he could not find the fight theme ______ , his explanation was vague.

A．to center his thoughts about

B．in which to center his thoughts

C．around which his thoughts to center

D．on which to center his thoughts

You can find whatever you need at the shopping center, ______ is always busy at the weekend.

A) that B) where C) what D) which

What is the definition of a Path？ ()

A．a sequence of vertices and the edges formed by each successive pair of vertices

B．a walk with distinct edges

C．a walk with distinct vertices

D．none of the above

What is the definition of a path？ ()

A．A sequence of vertices and the edges formed by each successive pair of vertices

B．A walk with distinct vertices

C．A walk with distinct edges

D．None of the above

For a standard external involute spur gear,,,, (1) when actual center distance, find meshing angleand pitch circle. (2) when meshing angle, find actual center distance，pitch circleand clearance. (3) compare the ratio offor the above two cases.

听力原文：W：Where can I find a map of the university campus？ I want to find a place．

M：Have you tried the information center？ I think they have，if not，they also can provide you with information on how you could get one.

Q：What does the man imply about the information center？

(17)

A．It is in the center of the campus.

B．It should have a map of the city.

C．It has information about summer camps.

D．It probably has a campus map.

How can the woman find the town center from here？

A．Cross over the bridge

B．Go northward

C．Turn right and carry straight on

D．Turn left and carry straight on

The x axis is the symmetry axis of a stationary uniformly charged ring of radius R and charge q. Find the potential at P on the axis at a distance x from the center of the ring

A、

B、

C、

D、