证券市场的层次结构是（）。

Which of the following is the major factor that affects the accuracy of potassium dating？

A．the number of the mineral pores

B．the number of missing argon atoms

C．external temperature

D．mineral temperature

Which of the following is the major factor that affects the accuracy of potassium dating？

A．the number of the mineral pores

B．the number of missing argon atoms

C．external temperature

D．mineral temperature

(Initial investment, Selling price, Sales volume, Variable cost).

A．Famine.

B．Tornadoes.

C．The number of predators.

D．The variety of food supply.

A.the probability that the variable increases in any period.

B.one plus the percentage change in the variable in each period.

C.the increase in the value of the variable in the next period.

D.one minus the “down-move factor” for the binomial tree.

maintenance？

A.cetane number

B.flash point

C.viscosity

D.setting point

Which operating procedure（s）should be adhered to on a Ro-Ro vessel ________．

A.One officer assigned to oversee the initial loading and lashing

B.All lashings should be completed before leaving port

C.Periodic inspection and retensioning of lashings during the voyage

D.All of the above

is TRUE ________．

A.Stack weights should be less when using a solid bar lashing as compared to a wire lashing

B.Stack heights may be increased when using a solid bar lashing

C.Stack heights should be reduced when using a solid bar lashing

D.Solid bars should be used for lashing the first tier only，with wire lashings on the higher tier（s）

firm’s short run production function is q=163x-2x2, where x is the amount of variable factor used. The price of output is $3 per unit and the price of the variable factor is $9 per unit. In the short run, how many units of x should the firm use？

A、20

B、80

C、19

D、40

.

A．Director B．Pointer C．Array D．Record