植物一生中光合作用形成的全部干物质去除消耗,剩下的成为()
A. 光合产物
B. 生物产量
C. 经济产量
D. 经济系数
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患者26岁,男性。2周前感冒。3天前背痛,同时觉双足、小腿发麻,尚能行走。次日麻木向大腿发展,走路时双足不灵活,迈步费劲。小便费劲。检查:双下肢肌力1~2级,肌张力低,腱反射对称减低,病理征阴性。T以下各种感觉消失,下述哪项是最可能的诊断
A. 脊髓灰质炎
B. 急性横贯性脊髓炎
C. 多发性硬化
D. 脊柱转移性肿瘤
E. 急性硬膜外脓肿
Your network contains a print server named Server1. Server1 has three shared printers named Printer1, Printer2, and Printer3. Each shared printer uses a different driver. You need to ensure that if Printer1 causes an exception, users can still print to Printer2 and Printer3. What should you do?()
Add a driver filter.
B. Add a printer filter.
C. Modify the print processor options.
D. Modify the driver isolation settings.