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【单选题】
、签订了一西瓜买卖合同,双方约定:卖给1000公斤西瓜,单价为0.6元/公斤。双方就履行顺序未作约定。已向供应了500公斤西瓜,现向提出付款请求,则( )A.
不得主张同时履行抗辩权，需给付全部价款；
B.
就已给付的500公斤西瓜的价款不得主张同时履行抗辩权，就未给付部分则可；
C.
得就全部价款主张同时履行抗辩；
D.
得主张履行不完全从而解除合同
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A.
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B.
All messages are sent to the logging host, where selections are made.
C.
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D.
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A.
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B.
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C.
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D.
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E.
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【单选题】对微生物作用的表述错误的是
A.
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B.
微生物杀虫剂可用于农业害虫的防治
C.
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D.
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E.
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