体育产业化的核心是按照（）的基本要求，合理运用市场经济的（）来办体育。

近似数是6.75的三位小数不止一个。

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不属于心力衰竭基本用药的是（）

A.β受体阻滞剂

B.洋地黄制剂

C.利尿剂

D.ACEI或ARB

E.钙拮抗剂

Professor Smith ___ China yesterday.

A．arrived at

B．arrived in

C．get go

D．reached for

压迫三叉神经导致原发性三叉神经痛的最常见血管是

A．小脑上动脉
B．小脑前下动脉
C．基底动脉
D．小脑后下动脉
E．岩静脉

During the day，a dredge will indicate the side on which it is safe to pass by displaying（）.

A.two balls in a vertical line

B.two diamonds in a vertical line

C.a single black ball

D.no shape is shown during the day