寒战、咳嗽、咯血痰及肺实变体征的疾病是()
A.肺炎球菌性肺炎
B.肝硬化
C.慢性肾小球肾炎
D.支气管扩张
E.右心功能不全
参考答案:A
已调节好的托盘天平测量铜块的质量,当天平平衡时,右盘中砝码有50g、20g 、10g各1个,游码的位置如图所示,则该铜块的质量是_________g。若把上述实验移到山顶上进行,测得的该铜块的质量将________(填“变大”“不变”或“变小”)
She is a bit shy and________the teacher's questions.[ ]
A. dares not answer
B. doesn't dare to answer
C. dare not to answer
D. dares not to answer