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问题 单项选择题

红细胞沉降率变快主要是由于（）。

A．红细胞数目增加

B．红细胞脆性增加

C．血浆白蛋白含量增加

D．血浆球蛋白含量增加

E．血浆晶体渗透压升高

答案

参考答案：D

填空题

如图所示 ，用平行于斜面、大小为1.25N的拉力将重为1.8N的物体从斜面底端匀速拉至顶端，则有用功是_________ J，机械效率是_________。
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单项选择题

Some forward contracts are termed cash settlement contracts. This means:()

A. either the long or the short in the forward contract will make a cash payment at contract expiration and the asset is not delivered. 

B. at settlement, the long purchases the asset from the short for cash. 

C. at contract expiration, the long can buy the asset from the short or pay the difference between the market price of the asset and the contract price.
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