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【单选题】【消耗次数：1】

① <img src=https://huaweicloudobs.ahjxjy.cn/8AB52E19EF0F2C523503F3A81E1605B0.png title=21-1.png alt=21-1.png/>

② <img src=https://huaweicloudobs.ahjxjy.cn/F22CA75EF108ACF7DA7AC84723888749.png title=21-2.png alt=21-2.png/>

③ <img src=https://huaweicloudobs.ahjxjy.cn/150C81F82441CAC446FE05C4DB1096A9.png title=21-3.png alt=21-3.png/>

④ <img src=https://huaweicloudobs.ahjxjy.cn/7FA52D728B3D630F399B98525E4B5B19.png title=21-4.png alt=21-4.png/>

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随机题目

【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/33CD9100EB360BCC7C8004EC657ED981.png title=Unnamed QQ Screenshot20170106195748.png alt=Unnamed QQ Screenshot20170106195748.png style=white-space: normal;/>

① 无解

② 仅有零解

③ 必有非零解

④ 也可能有非零解，也可能没有非零解

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【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/1F59AE5E36599BF461B8476730703DDD.png title=Unnamed QQ Screenshot20170106194520.png alt=Unnamed QQ Screenshot20170106194520.png style=white-space: normal;/>

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【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/FA1CF1667104B087FBDF9230F79CCBB4.png title=Unnamed QQ Screenshot20170106221430.png alt=Unnamed QQ Screenshot20170106221430.png style=white-space: normal;/>

① <img src=https://huaweicloudobs.ahjxjy.cn/0DAFD377749891DF1775713DC25C520E.png title=Unnamed QQ Screenshot20170106221442.png alt=Unnamed QQ Screenshot20170106221442.png style=white-space: normal;/>

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【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/92A72A75490A6E38933B9D45E392DA7C.png title=Unnamed QQ Screenshot20170106131017.png alt=Unnamed QQ Screenshot20170106131017.png style=white-space: normal;/>

① <img src=https://huaweicloudobs.ahjxjy.cn/8A0C63E83310CCB6E2F311C257772D41.png title=Unnamed QQ Screenshot20170106131035.png alt=Unnamed QQ Screenshot20170106131035.png style=white-space: normal;/>

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④ <img src=https://huaweicloudobs.ahjxjy.cn/435E476303B16CDB86A3DB639DD22865.png title=Unnamed QQ Screenshot20170106131100.png alt=Unnamed QQ Screenshot20170106131100.png style=white-space: normal;/>

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【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/8113250E0F2FD0433FA093580DDA5E0E.png title=Unnamed QQ Screenshot20170106091559.png alt=Unnamed QQ Screenshot20170106091559.png style=white-space: normal;/>

① 2

② -2

③ 3

④ -3

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【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/7BBDFC6401E8C30E1B45A41B079EE0AA.png title=Unnamed QQ Screenshot20170106093156.png alt=Unnamed QQ Screenshot20170106093156.png style=white-space: normal;/>

① 8

② 2

③ 0

④ 6

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【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/EAC7F1517AF4CDD2C63116D3CBCE8EE2.png title=QQ截图20170105222541.png alt=QQ截图20170105222541.png style=white-space: normal;/>

① <img src=https://huaweicloudobs.ahjxjy.cn/A127CD1DD6EEB74E6820960BFD01D22F.png title=QQ截图20170105222554.png alt=QQ截图20170105222554.png style=white-space: normal;/>

② <img src=https://huaweicloudobs.ahjxjy.cn/F688398F0AFBA6F46B0B1F940C8BB838.png title=QQ截图20170105222601.png alt=QQ截图20170105222601.png style=white-space: normal;/>

③ <img src=https://huaweicloudobs.ahjxjy.cn/DDEA614A37E33503D8927FD69D4486A6.png title=QQ截图20170105222609.png alt=QQ截图20170105222609.png style=white-space: normal;/>

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【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/A2B32A066BAF2281525EEF77DE0A8967.png title=QQ截图20170105222644.png alt=QQ截图20170105222644.png style=white-space: normal;/>

① <img src=https://huaweicloudobs.ahjxjy.cn/7EDC847E33E86807B0E4EC28972B4B81.png title=QQ截图20170105222653.png alt=QQ截图20170105222653.png style=white-space: normal;/>

② <img src=https://huaweicloudobs.ahjxjy.cn/E16337BBC730E255CA108E7C272BA06A.png title=QQ截图20170105222700.png alt=QQ截图20170105222700.png style=white-space: normal;/>

③ <img src=https://huaweicloudobs.ahjxjy.cn/493869BAF8D735EE235E25F13716F4AF.png title=QQ截图20170105222713.png alt=QQ截图20170105222713.png style=white-space: normal;/>

④ <img src=https://huaweicloudobs.ahjxjy.cn/AAAABAD89B983EF8F2748699F960F61D.png title=QQ截图20170105222720.png alt=QQ截图20170105222720.png style=white-space: normal;/>

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【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/E8A49C321411FF54CB54EDE7F0D4589B.png title=QQ截图20170105215056.png alt=QQ截图20170105215056.png style=white-space: normal;/>

① 充分不必要条件

② 必要不充分条件

③ 充分必要条件

④ 既不充分又不必要条件

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