物体从45米高处自由落体，若将其分成三段h1、h2、h3，这三段的运动时间相等，

He            a glass of milk just now. He was very careless. [ ]

A. knocked at

B. knocked on

C. knocked out

D. knocked off

An investor buys a stock at $90 and also buys a put option on the stock with a put price of $4 and having an exercise price of $80. At expiration of the put option, the stock price has fallen to $60. The loss for the investor's position would be :

A．

B．

C．

以下哪项不是感染性心内膜炎的临床表现（）

A.皮肤、黏膜瘀点

B.皮下小结

C.脾大

D.贫血

E.杵状指

男性，54岁，因胃癌行胃大部切除术。

该患者不宜过快进食大量糖类是为了预防（）。

A.高血糖

B.高脂血症

C.贫血

D.高渗性昏迷

E.倾倒综合征

听证主持人应当由公安消防机构的负责人员担任。（）