氢焰检测器的极化电压约在()之间。
参考答案:150~300V
下列的表述是关于在高层建筑及工业建筑中,地基常采用( )地基。
A.人工
B.天然
C.岩石
D.固结
I stayed up all night watching TV. The next morning, I felt too _____ to get up on time. [ ]
A. exhausted
B. excited
C. exhausting
D. exciting