克劳斯硫回收装置实际发生的反应十分复杂,但其主要反应并不多。
参考答案:对
We should do what we can ________ crime, because it is ________ danger to society. [ ]
A. reduce; /
B. to reduce; a
C. reduce; a
D. to reduce; /
肛查了解胎头下降程度的骨性标志是()。
A.骶岬
B.骶骨
C.坐骨结节
D.坐骨棘
E.坐骨切迹