沟槽开挖在5m以上时,对松散和湿度很高的土进行土壁支撑,应采用下列中的哪种支撑?() ["断续式水平挡土板支撑","垂直挡土板式支撑","连续式水平挡土板支撑","断续或连续式水平挡土板支撑"]
排精通道不包括() ["附睾","输精管","尿道","前列腺","射精管"]
在湿度正常的轻亚粘土及亚粘土中开挖基坑或管沟,可做成直立壁不加支撑的深度规定是:() ["≤0.5m","≤1.0m","≤1.25m","≤1.5m"]
(2012)反铲挖土机的挖土特点是:() ["后退向下,强制切土","前进向上,强制切土","后退向下,自重切土","直上直下,自重切土"]
茯苓抗肝硬化的成分是() ["A.茯苓素","B.猪苓多糖","C.茯苓醇","D.茵陈色原酮","E.茵陈黄酮"]
为什么说平均利润更加掩盖了资本主义剥削关系?