蒸汽暖炉时,加热炉炉膛的温度应控制在()。
A、30℃-100℃
B、100℃-200℃
C、200℃-300℃
D、300℃-400℃
参考答案:B
— One's week's time has been wasted.
— I can't believe we did all that work for _______. [ ]
A. something
B. none
C. nothing
D. anything
大鼠慢性肾衰实验的原理是什么?