呼气性呼吸困难
参考答案：
呼气性呼吸困难是指患者呼气显著费力，呼气时间延长而缓慢，常伴有广泛哮鸣音，见于支气管哮喘、喘息型慢性支气管炎、阻塞性肺气肿等。
双方约定需要试车的，应当组织试车，试车不包括( )。
A．单机无负荷试车
B．双机荷载试车
C．联动无负荷试车
D．投料试车
She is good at _____ and she often helps other students _____ their English. [ ]
A. schoolwork; to
B. schoolwork; with
C. schoolworks; to
D. schoolworks; with
