A、outwit
B、foil
C、attack
D、beat
A、outwit
B、foil
C、attack
D、beat
A、SX = 0, Sx = 0, SmA(F) = 0
B、SmO(F) = 0, SmA(F) = 0, SmB(F) = 0
C、SmO(F) = 0, SmC(F) = 0, SY = 0
D、SX = 0, SY = 0, SmO(F) = 0
A、SX = 0, SmO(F) = 0, SmA(F) = 0
B、SmO(F) = 0, SmA(F) = 0, SmB(F) = 0
C、SmA(F) = 0, SmC(F) = 0, SY = 0
D、SX = 0, SmA(F) = 0, SmB(F) = 0
A、Study ADB: åmA(F) = NB×2L + YD×L = 0
B、Study the whole system: åmA(F) = - P×(L+r) + NB×2L = 0
C、Study CDE and the pully: åmD(F) = - P×r - T×(L – r) + XE×L + SBC×L×sin30° = 0
D、Study the whole system: åmA(F) = - P×(L+r) + NB×2L - T×(L – r) = 0
A、SmA(F) = m + Psinq × L/2 + M + mA = 0
B、SmA(F) = -m - Psinq × L/2 + M = 0
C、SmA(F) = -mL - P × L/2 + M + mA = 0
D、SmA(F) = -m - Psinq × L/2 + M + mA = 0
A、6
B、9
C、12
D、3
A、Study AB: åmA(F) = -q×L×L/2 + S2 ×L/2 - P×3L/4 = 0
B、Study ABCDE: åmA(F) = -q×2L×L + S2 ×L/2 + S3×3L/2 - P×3L/4 + YB×L + NC×2L = 0
C、Study BC: åmB(F) = -q×L×L/2 – S3 ×L/2 – S5×L/2 + NC×L = 0
D、Study ABCDE: åmA(F) = -q×2L×L - P×3L/4 + NC×2L = 0
A、
B、
C、
D、
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