One of the signs of the awakening of the American Indians is（）
A. the reappearance of the"powwow"
B. the legal steps they are taking to recover land and resources that have been grabbed form them illegally
C. their refusal to live on reservations
D. None of the above
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在水准测量一个测站上，已知后视点A的高程为1656.458，测得A、B两点的高差为1.326。则可求得B点的高程为（）。
A. 1657.784
B. 1655.132
C. -1657.784
D. -1655.132
热轧无缝钢管生产过程中存在的危害有害因素有（）。
A. 运行中设备的机械伤害
B. 运行中轧件等的物体打击
C. 高温钢坯和蒸汽的灼烫
D. 起重作业过程中的伤害
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