The man who thought of ______a gas engine _____ wheels was the inventor of the automobiles.

A．comparing; with

B．combining ; with

C．competing;to

D．connecting; by

洗涤有油污的餐具时，常有以下几种说法：  

①只用冷水洗涤餐具  ②只用热水洗涤餐具  ③在冷水中加几滴洗涤剂洗餐具，再用净水漂洗  ④在热水中加几滴洗涤剂洗餐具，再用净水漂洗根据日常生活经验和所学知识回答：  

(1)洗涤后仍有油腻感是洗法________（填编号，下同），尤其是洗盛猪肉的餐具，简要说   明原因____________________________________________________________________；  

(2)洗得最干净且较易洗的洗法是____________，简要说明原因_______________________________________________________________________________________________；  探究结果，有油污的餐具、衣物不能只用________清洗，要洗涤干净可选用__________或_________或________。