高压管道加工中,相邻两管道的外壁不得相碰,间距必须大于( )mm。
A.10
B.30
C.40
D.50
参考答案:D
With the government's aid, those________by the earthquake have moved to the new settlements.[ ]
A. affect
B. affecting
C. affected
D. were affected
急性喉炎的描述哪项是错误的()
A.必有声音嘶哑
B.常有喉痛
C.全身症状可能轻微
D.治疗期间可用耳语代替发音
E.如治疗不及时或不合理,病变可累及喉内肌