【简答题】计算 IP 地址为 15.16.193.6 ,子网掩码为 255.255.248.0 的子网网络地址和广播地址各是多少
【简答题】为了便于结算,一个单位可以同时在多家金融机构开立银行基本存款账户。( )
【单选题】A profit maximizing firm continues to operate even though it is losing money. It sells its product at a price of $100. From these facts we deduce that:
A.
average total cost is less than $100.
B.
average fixed cost is less than $100.
C.
marginal cost is increasing.
D.
average variable cost is less than $100.
E.
marginal cost is decreasing.
【简答题】已知 m =(cosx,2sinx), n =(2cosx,-sinx),f(x)= m·n。 (1)求f(- π)的值; (2)当x∈[0, ]时,求g(x)= f(x)+sin2x的最大值和最小值。
【简答题】液压泵的密闭工作容积在吸满油之后向压油腔转移的过程中,形成了一个闭死容积。如果这个闭死容积的大小发生变化,在闭死容积由大变小时,压力急剧 ,使轴承受到周期性的压力冲击,而且导致油液发热;在闭死容积由小变大时,又因无油液补充产生 ,引起气蚀和噪声。这种因闭死容积大小发生变化导致压力冲击和气蚀的现象称为 。
【单选题】A profit maximizing dairy farm is currently producing 10,000 gallons of milk per day. The government is considering two alternative policies. One is to give the farm a lump sum subsidy of $500 per mon...
A.
Both kinds of subsidy will increase production at this farm
B.
Neither subsidy will aect production at this farm, since output is determined by profit maximization.
C.
Production at this farm will be increased if the per unit subsidy is adopted, but not if the lump-sum subsidy is adopted.
D.
Which subsidy has the greater eect on production at this farm depends on whether fixed costs are greater than variable costs.
【判断题】液压泵的密闭工作容积在吸满油之后向压油腔转移的过程中,形成了一个闭死容积。如果这个闭死容积的大小发生变化,在闭死容积由大变小时,其中的油液受到挤压,压力急剧升高,使轴承受到周期性的压力冲击,而且导致油液发热;在闭死容积由小变大时,又因无油液补充产生真空,引起气蚀和噪声。这种因闭死容积大小发生变化导致压力冲击和气蚀的现象称为困油现象。困油现象将严重影响泵的使用寿命。原则上液压泵都会产生困油现象。