用于治疗青霉素过敏或无效的肺炎，急性扁桃体炎等症的是（）
A、青霉素
B、氯霉素
C、头孢菌素
D、庆大霉素
E、红霉素
参考答案：E
The committee has the plan we'd like to see next week.[ ]
A. agreed with; to be carried out
B. approved of; carried out
C. agreed to; being carried out
D. approved of; being carried out
当圈梁遇到洞口不能封闭时，搭接的附加梁长度应不小于( )m，且应大于两梁高差的2倍。
A．1 B．2C．1.5 D．2.5
