操纵_______是改变旋翼尾桨拉（推）力的主要手段
B
暂无解析
Astothevariouspollutions,whichofthefollowingisNOTtrue?
_______thefirstlanguageisusedintheteachingofthesecondlanguageintheGrammar-TranslationMethod.
集权主义
除哪项外，下列皆可为血瘀的病因
Shouldyourprice______reasonable,wewillplaceanorder______you.
