题目内容

无公害农产品产地应当符合哪些条件?

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无公害农产品的生产管理条件有哪些?

特快及快速货物班列自动制动机主管压力为()kPa。

A. 500
B. 550
C. 600

Trunk type diesel engine pistons are effectively cooled when heat is()

A. radiated through the engine block
B. transferred to water cooled cylinder walls
C. conducted through the piston crown
D. transferred to escaping exhaust gase

饮水中添加电减多维防止部分雏鹅过渡期营养不良,在饲料中添加“乳酸钙”适量,预防雏鹅缺钙跛脚()

A. 正确
B. 错误

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