下列不属于支气管扩张临床表现的是（）
A.胸腔积液
B.咳脓痰
C.肺部感染
D.咯血
E.咳嗽
参考答案：A
If you want to become thinner and healthier. You should eat _______food and take ________exercise.
A．less; fewer
B．more; less
C．fewer ;more
D．less; more
真空断路器主回路电阻的初值差应小于（）。
A.10%
B.20%
C.30%
D.40%
