当锅炉的出口蒸汽压力受负荷干扰而变化时，热负荷控制系统可通过调节（）使其稳定。
A、给水量
B、燃烧量
C、送风量
D、蒸汽量
参考答案：B
1型糖尿病的病理生理改变是（）。
A.胰岛素绝对缺乏
B.胰岛素相对缺乏
C.胰岛素抵抗
D.胰岛素相对缺乏及胰岛素抵抗
E.需使用胰岛素治疗
·Look at the ten statements for this part. ·You will hear a passage about "Who First Started to Smoke" ; you will listen to it twice, ·Decide if you think each statement is right(R), wrong(W) or not mentioned(NM).
Who First Started to Smoke
The American Indians used long tubes to bake tobacco before they smoked it.
A．Right
B．Wrong
C．Not Mentioned
