三合土
参考答案：
石灰与粘土、砂石、炉渣等填料拌制，即成三合土。
I（）finish my homework now. I can do it at the weekend.
A.have to
B.don‘t have to
C.must
D.mustn‘t
胸部查体语音震颤不增强的病变首选
A．肺实变
B．大空洞
C．肺纹理增强
D．胸腔积液
E．肺囊性病变
