题目内容

示范区建设要贯彻党中央、国务院关于建立健全农业标准体系和（）的要求，结合农业生产需要，以发展高产优质高效农业为目标，以一种或一类农产品为龙头，对农产品的生产、加工、流通全过程实行综合标准化管理。

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（）不是液压制动系统卡死的原因。

A. 总泵皮碗、密封胶圈老化、发胀或翻转
B. 制动蹄摩擦片与制动鼓间隙过小
C. 总泵旁通孔或回油孔堵塞
D. 制动管路凹瘪或老化、堵塞

FTP服务的作用，它基于哪种传输层协议实现？

(1) is a method of constructing a project schedule network diagram that uses boxes or rectangles, referred to as nodes, to represent activities and connects them with arrows that show the dependencies.This method includes following types of dependencies or precedence relationships: (2) the initiation of the successor activity, depends upon the completion ofthe predecessor activity.(3) the initiation ofthe successor activity, depends upon the initiation ofthe predecessor activity.空白（1）处填（）

A. PDM
B. CPM
C. PERT
D. AOA

(1) is a method of constructing a project schedule network diagram that uses boxes or rectangles, referred to as nodes, to represent activities and connects them with arrows that show the dependencies.This method includes following types of dependencies or precedence relationships: (2) the initiation of the successor activity, depends upon the completion ofthe predecessor activity.(3) the initiation ofthe successor activity, depends upon the initiation ofthe predecessor activity.空白（2）处填（）

A. F-S
B. F-F
C. S-F
D. S-S