骨盆最 * * 面其前方是耻骨联合下缘,两侧为坐骨棘,其后方是
A.骶岬
B.第3、第4骶椎问
C.第4、第5骶椎间
D.骶骨相应部位
E.骶尾关节
参考答案:D
Facing a beggar, I may feel this poor person needs help, and the need will not be met _____ I put my
hand in my pocket now.[ ]
A. since
B. in case
C. unless
D. while
锅炉给水泵把除氧器内的水送到锅炉汽包内,当汽包内液面压力升高时,锅炉给水泵工作点流量Q和扬程H的变化是()
A、Q加大,H升高
B、Q减小,H降低
C、Q加大,H降低
D、Q减小,H升高