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为什么要求临场指挥的教练员要有良好的心理素质与抗负荷能力？

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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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企业培训工作者为什么要掌握现代培训技术和手段？

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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

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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

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