机车制动缸的压力空气是由()直接供给的,所以机车制动缸鞲鞴行程的长短不影响机车制动力。
A、控制风缸
B、工作风缸
C、总风缸
D、作用风缸
参考答案:C
读一读,将下列句子排序。
( ) How beautiful! You can sing and dance in it. Is this the art room?
( 1 ) This is our school. This way, please.
( ) It's big. You can play ping-pong in the gym.
( ) Look! This is the gym.
( 6 ) Yes, it is. We draw pictures in it.
( ) And this is the music room.
某均质砂土建筑地基采用沉管砂石桩处理。砂土地基的天然地基承载力为130kPa,砂土地基的天然孔隙比e0=0.79,最大孔隙比emax=0.8,最小孔隙比emin=0.65,要求处理后砂土的相对密实度达到D=0.82。初步设计时,按等边三角形布桩,砂石桩直径为0.6m,处理后桩间土承载力特征值为160kPa。按《建筑地基处理技术规范》JGJ79-2012作答。试问:
假定等边三角形布桩,D=0.82时,桩土应力比为2.0,处理后的复合地基承载力特征值fspk(kPa)最接近于下列()项。
A.168
B.178
C.187
D.192