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【单选题】
喷射钻井中，射流的主要作用是（）。A.
产生压特
B.
清洁井底
C.
刮挤地层
D.
无作用
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皮皮学刷刷变学霸
举一反三
【单选题】Average fixed cost is:
A.
total cost divided by the number of units produced over a given period.
B.
total fixed cost divided by the number of units produced over a given period.
C.
the price of a fixed factor of production.
D.
fixed cost divided by the number of units of a fixed input employed over a given period.
【简答题】地陪小董接待的团队按照计划临走前在当地品尝风味。傍晚，小董带领全体旅游者乘车来到一家名气很大的百年老店用餐。餐厅环境一流，服务上乘，所上菜肴都为当地名菜。为此，旅游者们食欲大开，1：7福大饱，频频举杯。离开餐厅时，有位游客醉意很浓，走路不稳，可是嘴里连连说自己没有喝多，还推开搀扶他的人。刚走到餐厅门口这位游客就摔倒在地，不省人事。小董立刻与其他客人把他抬上旅游车，送往所的饭店。紧接着小董又打电...
【简答题】游客在用餐时因酒醉而摔伤 地陪小董接待的团队按照计划临走前在当地品尝风味。傍晚，小董带领全体旅游者乘车来到一家名气很大的百年老店用餐。餐厅环境一流，服务上乘，所上菜肴都为当地名菜。为此，旅游者们食欲大开，1：7福大饱，频频举杯。离开餐厅时，有位游客醉意很浓，走路不稳，可是嘴里连连说自己没有喝多，还推开搀扶他的人。刚走到餐厅门口这位游客就摔倒在地，不省人事。小董立刻与其他客人把他抬上旅游车，送往所下...
【单选题】Average fixed cost:
A.
can be calculated by dividing total fixed cost by the level of output produced.
B.
can be graphed as a horizontal line, with dollars on the vertical axis and quantity on the horizontal axis.
C.
decreases as output increases.
D.
is characterized by both a. and c.
【单选题】下列关于多式联运单据的叙述，错误的是( )。
A.
多式联运单据是多式联运合同的证明
B.
多式联运单据具有物权凭证的性质和作用
C.
多式联运单据是多式联运承运人收到货物的凭证
D.
多式联运单据是多式联运承运人签发的，保证据此交付货物的单证
【单选题】Average fixed cost:
A.
remains unchanged as output expands.
B.
is defined as the change in total cost divided by the change in output.
C.
always increases as output increases.
D.
always decreases as output expands.
【单选题】Average fixed cost:
A.
declines continuously as output increases.
B.
is always greater than average variable cost.
C.
equals the difference between average total cost and average variable cost.
D.
is characterized by both (a) and (c).
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