该办公楼位于地上104层的避难层按设计要求应满足300人避难的要求,该避难层的净面积不宜小于()m2。
A. 60
B. 50
C. 70
D. 80
M131开动砂轮后打开总油门将砂轮座快速油压手柄放置向前位置,砂轮座前秒稳定后约离工件()毫米。
A. 1mm
B. 3mm
C. 5mm
D. 7mm
If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the ()
A. fuel line connections to cylinder injection valves
B. gasket surfaces of the fuel oil filters
C. discharge fitting of the fuel injector pumps
D. suction side of the fuel oil tra
感知电流是在一定概率下,通过人体引起人有任何感觉的最小电流(有效值),称为该概率下的感知电流。
A. 正确
B. 错误