矿山救护中队应当由不少于（）个救护小队组成。
A.1
B.2
C.3
D.4
参考答案：C
_______ with what the students had done, the teacher praised them highly.[ ]
A. Delight
B. Delighting
C. Delighted
D. Being delighting
裸导体的正常最高工作温度不应大于( )℃
A．50
B．60
C．70
D．80
