承运人不办理蜜蜂的变更。
参考答案：对
I noticed my little son ____ the words ____ on his small blackboard. [ ]
A. read; writing
B. reading; writing
C. to read; written
D. read; written
当筏形基础混凝土强度达到设计强度的( )时，可进行基坑回填。
A．40%
B．20%
C．30%
D．10%
