当我们看一座假山,尽管它的尺度很小,但仍然可以知觉是山的形状,这是由于知觉具备()
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水害抢险时,应注意工地和建筑物附近有无冲空、坍塌和其他异状,及时采取安全防护措施。
A. 正确
B. 错误
SS4型电力机车上普通小型直流电动机检修要求:用塞尺检查电刷在刷握内的轴向间隙为()。
A. 0.05~0.20mm
B. 0.05~0.30mm
C. 0.06~0.20mm
D. 0.06~0.30mm
细波浪线的用途是部分省略表示时的断开界线,曲线形构件断开界线、构造层次的断开界线。
A. 正确
B. 错误
A small fuel spillage has occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by,the next step is to().
A. proceed with fueling operation
B. have helicopter move to a safer location
C. wash spilled fuel away with a flood of water
D. clean spilled fuel with rag