【简答题】排桩采用( )桩与( )间隔布置的钻孔咬合桩形式时,支护桩的桩径可取 800mm~1500mm,相邻桩咬合长度不宜小于( )。素混凝土桩应采用塑性混凝土或强度等级不低于C15的超缓凝混凝土,其初凝时间宜控制在 40h~70h之间,坍落度宜取 12mm~14mm。
【简答题】A scientist is a person who works in and has expert knowledge of a particular field of __________. Or, more generally, any person who studies or works in a scientific field.
【单选题】( ) A person who works on a plane.
【简答题】__________ a person who works in the kitchen and cooks food
【简答题】_________ a person who works on the telephone switchboard in a restaurant