绘制自由锻锻件图时，为简化锻件形状，需加上（）
A.敷料
B.余量
C.斜度
D.公差
参考答案：A
12. Mr. Johnson enjoyed _____ by working in the factory again because he always hates _____ while staying alone at home all day long.
A．him; that
B．it; it
C．himself; it
D．himself; that
庆大霉素与呋塞米合用时可引起（）
A.抗菌作用增强
B.肾毒性减轻
C.耳毒性加重
D.利尿作用增强
E.肾毒性加重
