名义厚度为：（） A.强度公式计算所得的厚度值 B.计算厚度加腐蚀余量 C.图上所标

Rock- climbing is a breathtaking sport，      courage plays an important role.

A．which

B．whose

C．where

D．when

— It's burning hot today, isn't it?

— Yes, _____  yesterday. [ ]

A. So was it

B. So it was

C. So it is

D. So is it

营养不良的患者尿量增多的可能原因是()

A．肾小球滤过率增加

B．血管升压素分泌减少

C．醛固醇分泌减少

D．尿素生成增加

E．以上均不对

最易氧化变质的煤种是褐煤。

如何安全使用燃气热水器？