过热器喷水减温调节系统中的主调节信号是（）。
A.过热器出口汽温
B.减温器后的汽温
C.喷水水温
D.喷水量
参考答案：C
Only with the greatest of luck _____to escape from the rising flood waters.
A．managed she
B．she managed
C．did she manage
D．she did manage
肺痿的治疗原则是
A．温肾补肺
B．抑肝补肺
C．补肾填精
D．补脾益气
E．补肺生津
