设MC为边际成本，MR为边际收益，AC为平均成本。在完全竞争市场条件下，企业的短期均衡条件是（）。

A:MC=ACMR>AC B:MC=MR，MR>AC C:MC=MR，AC>MR D:MC=MR，MR

在完全竞争市场厂商的长期均衡产量上必然有：（）

A:MR=LMC≠SMC，式中MR=AR=P； B:MR=LMC=SMC≠LAC，式中MR=AR=P； C:MR=LMC=SMC=LAC≠SAC，式中MR=AR=P； D:MR=LMC=SMC=LAC=SAC，式中MR=AR=P。

在完全竞争厂商的长期均衡产量上必然有（）

A:MR=LMC≠SMC，其中MR=AR=P B:MR=LMC=SMC≠LAC，其中MR=AR=P C:MR=LMC=SMC=LAC≠SAC，其中MR=AR=P D:MR=LMC=SMC=LAC=SAC，其中MR=AR=P

完全竞争市场均衡时，在厂商均衡产量上必然有（）

A:MR＝LMC≠SMC，其中MR＝AR＝P B:MR＝LMC＝SMC≠LAC，其中MR＝AR＝P C:MR＝LMC＝SMC＝SAC≠LAC，其中MR＝AR＝P D:MR＝LMC＝SMC＝SAC＝LAC，其中MR＝AR＝P

Two men are walking in the park. One is Mr. Brown , a worker, the other is Mr. Black. Mr. Brown is going to a chair. It is next to the roaD. Mr. Black is after him. Mr. Brown finds Mr. Black. Now Mr. Black begins to walk faster(更快). Because he wants to get to the chair before Mr. Black. Now Mr. Black begins to walk faster because he also wants to get to the chair first. Then they both run. Mr. Black runs faster than (比) Mr. Brown. So he gets to the chair first and sits down on it. Mr. Brown runs after Mr. Black. When he gets to the chair. He sees Mr. Black sitting on it. He is sorry to show a notice(通知)with the words“Wet Paint(油漆未干)”to Mr. Black . Now Mr. Black knows why Mr. Brown is going to the chair.

( )1.Where are Mr. Brown and Mr. Black?

A.In the gardenB.On the chairC.In the parkD.Next to the road

( )2.What are they doing? They are________

A. talkingB.walking to the chairC.holding a noticeD.sitting on a chair

( )3._________is after _________at first

A. Mr. Black , Mr. BrownB.The worker, Mr. Brown

C.Mr. Brown ,Mr. BlackD.Mr. Brown The worker

( )4.________get to chair first.

A.The workerB.Mr. BrownC.Mr. BlackD.A student

( )5.Mr. Brown goes to the chair because__________.

A.he wants to sit thereB.it is his chair

C.he wants to talk to Mr. Black on the chairD.he wants to tell people “Wet Paint”

1C 2B 3A 4B 5D

Two men are walking in the park. One is Mr Brown , a worker, the other is Mr Black. Mr Brown is going to a chair. It is beside the roaD. Mr Black is after him. Mr Brown finds Mr Black. Now Mr Black begins to walk faster(更快). Because he wants to get to the chair before Mr Black. Now Mr Black begins to walk faster because he also wants to get to the chair first. Then they both run .Mr Black runs faster than (比) Mr Brown. So he gets to the chair first and sits down on it. Mr Brown runs after Mr Black. When he gets to the chair. He sees Mr Black sitting on it. He is sorry to show a notice(通知)with the words“Wet Paint(油漆未干)”to Mr Black . Now Mr Black knows why Mr Brown is going to the chair.

( ) 1Where are Mr Brown and Mr Black?

A.In the gardenB. On the chairC. In the parkD.Beside the road

( )2What are they doing? They are________

　A. talkingB.walking to the chair

C.holding a noticeD.sitting on a chair

( )3_________is after_ ________at first

A.Mr Black ,Mr BrownB.The worker, Mr Brown

C.Mr Brown ,Mr Black D.Mr Brown The worker

( ) 4________get to chair first.

　A.The workerB.Mr BrownC.Mr BlackD.A strange(陌生人)

( ) 5Mr Brown goes to the chair because__________.

　A.he wants to sit thereB.it is his chair

　C.he wants to talk to Mr Black on the chairD.he wants to tell people “Wet Paint”

 1.C    2.B    3.A    4. C   5. D

有下列离子晶体立体结构示意图： 若以M.代表阳离子，以R.代表阴离子，则各离子晶体的组成表达式完全正确的组合是：(　　)

A:①MR　②MR₂　③MR₃　④MR₄ B:①MR　②MR₂　③MR₂　④MR C:①MR₂　②MR₂　③MR₂　④MR D:①MR　②MR　③MR₂　④MR_2:zzstep]

在完全竞争厂商的长期均衡产量上必然有()。

A:MR=LMC≠SMC，其中MR=AR=P B:MR=LMC=SMC≠LAC，其中MR=AR=P C:MR=LMC=SMC=LAC≠SAC，其中MR=AR=P D:MR=LMC=SMC=LAC=SAC，其中MR=AR=P。