救护侦察时，应探明（）。
A.事故类别
B.范围
C.遇险遇难人员数量和位置
D.盲巷
参考答案：A, B, C
John knows so much about stars that I am sure it would be impossible to find someone who is ___ to him.
A．similar
B．same
C．equal
D．polite
征收工伤保险费实行（）费率和浮动费率相结合是事故预防的主要机制。
A.定额
B.差额
C.差别
D.级差
