钢丝绳用编接连接时,编接长度应不小于钢丝绳直径的()倍,并且不得小于300mm。连接承载能力不得小于钢丝绳破断拉力的90%。
A.10
B.15
C.20
D.25
参考答案:B
饲料在加工运输过程中()的现象,称为自动分级。
A、营养成分改变
B、混合均匀度不变
C、混合均匀度升高
D、混合均匀度降低
Production of mechanical foam by a portable in-line foam proportioner().
A.increases the size of foam bubbles formed
B.increases the rate of foam production
C.improves the extinguishing properties of foam
D.gives the nozzleman more freedom of movement,since it can be placed anywhere in the hose line