施工现场停止作业1小时以上时，应将动力开关箱断电上锁。
参考答案：对
Tom , rather than his teammates ,_______ for the failure of the volleyball match.
A were to blame B was to blame C were to blame D was to be blame
上颌窦恶性肿瘤的5年生存率为（）
A.5％～10％
B.10％～20％
C.30％～40％
D.40％～50％
E.50％～60％
