【单选题】The diameter and length of a circular shaft are D= 300px, L= 1m, both ends of which are exerted with the torques of magnitude T = 30 kN·m. The shea r modulus G= 80 GPa . Determine the relative angle o...
【简答题】Company B imported wheat from a foreign company. It was contracted "Quantity: 2,000,000 M/T, USD 100 per M/T FOB ..." But the foreign company shipped 2,300,000 M/T. Question: (1) How to deal with the ...
【简答题】A logger planned to work from 6 AM t0 4 PM with 30 minutes for lunch. If the skidder spent 30 minutes waiting for trees to be felled, 45 minutes replacing a hydraulic fitting, and 20 minutes moving to...