证券公司申请介绍业务资格，对外担保及其他形式的或有负债之和不高于净资产的20％，但因证券公司发债提供的反担保除外。（）
参考答案：错
A project team is in the design stage of a new mountain bike prototype. The team is in the process of identifying which type of frame and material will provide high performance at a low cost. Which of the following is the MOST likely technique used to determine these variables
A) Benefit/cost analysis.B) Ishikawa diagram.C) Design of experiments.D) System flow chart.
生育时期不同，干物质分配的中心也有所不同，谷类作物拔节至抽雄，生长中心是（）；开花至成熟，生长中心是（）。
