How are riveted lap joints made watertight?()
A. The faying surfaces are coated with white lead (or similar product) before the rivets are set
B. A sealing weld bead of 1/8" or less pitch is run along the plate edge
C. The plate edge is split close to an adjacent plate and mechanically forced into contact with the adjacent plate
D. A properly riveted joint will be watertight; any leakage is stopped by setting up on the rivet
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下列网络连接方式中.带宽最窄、传输速度最慢的是()。
A. 普通电话拨号网
B. ADSL
C. ZSDN
DDN专线
矩阵强弱取决于项目经理具有的对项目参与者的直接权力大小。
A. 正确
B. 错误
流体流过标准孔板时,流速在标准孔板的()收缩到最小。
A. 进口处;
B. 圆柱形开孔处;
C. 出口处;
D. 出口后一定距离处。