市场机会的价值大小是由市场机会的吸引力和（）两方面变量决定的 A.可靠性 B.可依赖

某温度时,BaSO₄在水中的沉淀溶解平衡曲线如下图所示。下列说法正确的是(　　)

提示:BaSO₄(s)Ba²⁺(aq)+S(aq)的平衡常数K_sp=c(Ba²⁺)·c(S),称为溶度积常数。

A．加入Na₂SO₄可以使溶液由a点变到b点

B．通过蒸发可以使溶液由d点变到c点

C．d点无BaSO₄沉淀生成

D．a点对应的K_sp大于c点对应的K_sp

根据不同时期泄水道的特点，分段围堰导流方式包括（）。

A.明渠导流

B.通过永久建筑物导流

C.涵管导流

D.束窄河床导流

E.隧洞导流

The trip to that city was eye-opening for everyone, and near its end , all the young people in our group began to reflect on what it had meant. We __21__ the first night we had arrived. We had all gone into the markets of the city __22__ the young people could experience its energy. But what we actually saw simply   23 us all –the rundown houses, the children in rags, the people begging for money… Walking home,  24  under a low bridge, we came across  25  families of homeless people seeking a bit of dry ground to sleep on  26  he night. We had to step over bodies as we found our way through the darkness.

The poverty(贫困) was  27  than anything my young companions had ever imagined. Back in the hotel, an air of sadness settled over the group. Many  28  and cried. Spending time in this  29  moves a person to care about humanity.

That evening, our group spent hours talking about what we had  30  . Gently, I encouraged everyone to talk about the difficult  31  that day’s discoveries had inspired. Sitting together  32  a circle as everyone had a chance to speak, we all began to realize that  33  of us was alone in our struggle to cope with our reactions.

Based on my  34  in poverty-stricken areas, I suggested that  35  the emotions we had were painful, they could also be important in helping us to move forward. We all  36  that we had seen things that should never be allowed to happen.  37  , what could we do about it? Together, we began to brainstorm ways we could help to ease the  38  we had seen. As I encouraged group members to focus on  39  they could do, a sense of determination  40  the previous sadness. Instead of despair, these young people began to feel a call to action.

21．A．put up with       B．got back to      C．looked back on      D．made up for

22．A．now that         B．so that          C．as if              D．even if

23．A．puzzled          B．annoyed          C．embarrassed        D．shocked

24．A．marching         B．running          C．passing            D．moving

25．A．entire           B．normal          C．average            D．general

26．A．beyond           B．with             C．till                D．for

27．A．stronger         B．deeper           C．worse               D．less

28．A．gave up          B．broke down       C．set off             D．held on

29．A．environment       B．hotel             C．house               D．background

30．A．inspected         B．attempted        C．witnessed         D．challenged

31．A．feelings          B．decisions         C．thoughts          D．impressions

32．A．along            B．around           C．by                 D．in

33．A．neither           B．either            C．none             D．each

34．A．experiences       B．schedules         C．data             D．position

35．A．once             B．while            C．since             D．unless

36．A．supposed         B．advised           C．confirmed         D．agreed

37．A．Surely           B．Rather            C．Now               D．Indeed

38．A．burden           B．suffering          C．anxiety          D．difficulty

39．A．how             B．where           C．what                D．when

40．A．replaced          B．changed          C．covered          D．improved

下列关于人参对物质代谢的作用，错误的是（）

A.促进蛋白质合成

B.促进核酸合成

C.降低血脂

D.抗动脉硬化

E.对血糖无影响

限位定位器的限位间隙应符合设计要求，定位管伸出支持器的长度为30-80mm。