要在轴上错开一定正确角度安装嵌装件，（）较容易，而（）则要难度较大。
参考答案：各嵌装件上做出合适位置的键槽；在轴上做出键槽
下列哪些属于职业或环境引起的间质性肺疾病（）。
A.蘑菇肺
B.饲鸽肺
C.煤Ⅰ尘肺
D.硅沉着病
E.石棉肺
—Excuse me. Is there a library near here?
—Walk down this road, _______you can see it on your right. [ ]
A. and
B. so
C. but
D. or
