计算题：产量折算系数的计算，生石灰生烧10%。
参考答案：
0.56×（1+10%）=0.616t灰/t石
— Why does the lake smell terrible?
— Because large quantities of water _________.[ ]
A. have been polluted
B. has polluted
C. have polluted
D. has been polluted
混合减影经历了哪两个阶段（）
A.先消除背景，再消除伪影
B.先消除噪声，再消除伪影
C.先消除软组织，后消除骨组织
D.先消除骨骼，再消除对比剂
E.先消除软组织，再消除对比剂
