对预抽煤层瓦斯区域防突措施效果检验时,煤层残余压力()0.74MPa时,预抽区为无突出危险区。
A、等于
B、大于
C、小于
参考答案:C
When the little boy spoke English, people there always _ him. [ ]
A. laughed at
B. are friendly to
C. got used to
D. were afraid of
鸡血藤来源于()
A.茜草科
B.瑞香科
C.豆科
D.毛茛科
E.木通科