[ζ]t表示材料在压力容器()时的许用应力。
A.操作时环境温度
B.设计温度
C.液压试验温度
D.介质温度
参考答案:B
It is said that his health ______ by years of hard working.
A.has been destroyed
B.has destroyed
C.is destroying
D.had been destroyed
下列哪一种物质中毒不引起潮红面容()
A.阿托品
B.烟酸
C.甲醇
D.氧化铅
E.溴甲烷