吗啡常见的不良反应有（） A.皮肤瘙痒、尿潴留、偶尔也引起呼吸抑制 B.高热 C.腹

根据市场的竞争和垄断程度，行业市场结构基本可以分为( )。

A．完全竞争

B．不完全竞争

C．垄断竞争

D．弱式市场

E．完全垄断

某同学穿钉鞋赛跑时，脚对鞋压强是p₁，鞋对跑道的压强是p₂，则（　　）

A．p₁＞p₂

B．p₁＜p₂

C．p₁=p₂

D．条件不够，无法比较

摄氏100℃相当于华氏（）°F.

A.212

B.32.0

C.312.15

D.273.15

An analyst estimates that an initial investment of $500 000 in a venture capital project will pay $6 million at the end of five years if the project succeeds and that the probability the project survives to the end fifth year is 25 percent. The required rate of return for the project is 19 percent. The expected net present value of the venture capital investment is closest to.（）

A. $128754.

B. $152632.

C. $236486.

野兽派有什么特点？