液压感载比例阀装置安（）在制动缸到后轮缸之间的管路中
A、前后联结
B、并联
C、混联
D、串联
参考答案：D
若函数f（x）=sinx+2|sinx|，x∈[0，2π]的图象与直线y=k有且仅有两个不同的交点，求k的范围．
Was it at the school ______ was named after a hero _____ he spent his childhood?
A．which; that
B．where; where
C．that; where
D．which; where
