心肌组织和脑组织的声衰减程度属于()。
A.极低衰减
B.低衰减
C.中等衰减
D.高衰减
E.极高衰减
参考答案:C
解析:心肌组织和脑组织的声衰减程度属于中等。
---Nowadays more and more people move to cities because there are better job opportunities.
---I don’t agree. Most of them remain unemployed, cannot afford housing and eventually __ living in poverty.
A.finish up
B.take up
C.end up
D.put up
单级单吸悬式离心水泵的代号是()。
A、D型
B、IS型
C、SH型
D、Y型