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【单选题】
采购最主要的目的是（）A.
加快商品周转的速度
B.
合理利用物质资源
C.
为了维持企业的正常产销活动及降低产销成本
D.
提高企业研发工作的质量
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反馈参考答案：
举一反三
【简答题】图示凸轮机构中,顶杆AB可沿铅垂导向套筒运动,其端点A 有弹簧紧压在凸轮表面上。设凸轮以匀角速度ω转动,在图示位置时,OA=r,凸轮轮廓曲线在A点的法线An与OA的夹角为θ,曲率半径为ρ。求此瞬时顶杆平移的速度及加速度。
【单选题】Some new and ______________ stations have first-class seat waiting areas.
A.
big
B.
small
C.
heavy
D.
light
【单选题】Some stations have a ( ), and you may leave your luggage here for some 5 to 10 RMB varying with the deposit time.
A.
shop
B.
waiting hall
C.
luggage office
D.
left luggage office
【单选题】Some stations have a( ), and you may leave your luggage for some 5 to 10 RMB varying with the deposit time.
A.
shop
B.
waiting hall
C.
luggage office
D.
left luggage office
【单选题】Some power stations have been modernized to give off less pollution, or they were moved further away from the living areas in order to ______ the damage.
A.
increase
B.
decrease
C.
ease
D.
lower
【简答题】黏膜相关淋巴组织主要包括肠相关淋巴组织, 相关淋巴组织和支气管相关淋巴组织等。
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