研究发现，抽屉原理中，“抽屉”至少放的物体的求法是用物体数除以______，当除得的商没有余数时，放的至少数就等于______，当除得的商有余数时，放的至少数就等于______．

When a project manager is engaged in negotiations，non-verbal communication skills are of______．

A．little importance

B．major importance

C．importance only when cost and schedule objectives are involved

D．importance only to ensure you win the negotiation