A.問(wèn)題說(shuō)得簡(jiǎn)單而清楚 B.不問(wèn)對(duì)方難回答的問(wèn)題 C.語(yǔ)言要通俗易懂 D.一次問(wèn)兩個(gè)問(wèn)題 E.在安靜的環(huán)境下提問(wèn)
A.疼痛 B.愉快 C.水腫 D.乏力
A.鋅B.鈣C.磷D.鎂