在钢的退火工艺中，不完全退火的目的不包括（）。

A．降低硬度

B．改善切削加工性能

C．细化组织

D．消除内应力

The 12-foot low-velocity fog applicator（）.

A.has a spray pattern 12 feet in diameter

B.can be used in conjunction with both 1-1/2 inch and 2-1/2 inch all-purpose nozzles

C.has a 90°bend at its discharge end

D.has a screw thread end which connects to the all-purpose nozzle