Linear bar grilles consist of parallel bars of extruded metal. the bar cross section can be designed to deflect air at a specified angle. deflection influences:

 The correct answer is :  The deflection angles of the core 0 °, 15 ° and 45 °

Explanation:  These angles of deflection of the nucleus serve for a precise directional contol of the air supply or the use of the return air. For floor use, the AL1 model air grilles are the most suitable with FG or FH edges due to strong reinforcement. Dust deposits are easily cleaned by removing the core from its frame. The models that are installed on the roof come with welded cores.

a. the moon was locked into orbit by the earths gravity as it was passing by and capture hypothesis i think