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【单选题】
已知产量为500单位时,平均成本是2美元,产量增加到550单位时,平均成本等2.50美元。在这个产量变化范围内,边际成本A.
随着产量的增加而上升, 并在数值上大于平均成本。
B.
随着产量的增加而上升, 并在数值上小于平均成本。
C.
随着产量的增加而下降, 并在数值上大于平均成本。
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【单选题】The girl will not become a nurse because she will faint at the ______ of blood.
A.
vision
B.
eyes
C.
sight
D.
view
【判断题】The nurse suggests that Peter should try to avoid staying with his family members.
A.
正确
B.
错误
【简答题】If A=[11,22,21],then min(A)=(_);
【简答题】20-10 三相异步电动机运行时,若负载转矩不变而电源电压下降10%,对电机的同步转速 、转子转速n、主磁通 、转子电流 ,转子功率因数 、定子电流 等有何影响?如果负载转矩为额定转矩,长期低电压运行,会有何后果?
【单选题】Which finding suggests to the nurse that a client with bleeding esophageal varices is experiencing a side or adverse effect of vasopressin therapy?
A.
Complaints of chest pain
B.
Bounding peripheral pulses
C.
Temperature of 102°F (39.8°C)
D.
Blood urea nitrogen (BUN) of 20 mg/dL (7.1 mmol/L)
【单选题】When tomatoes were brought to Europe from America, people who bought them thought they _____ red apples. [ ]
A.
had bought
B.
bought
C.
were buying
D.
would buy
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