混凝土外加剂同厂家、同品种、同批号、同出厂日期的外加剂每100吨为一批。
参考答案：错
— I want someone to write the composition for me.
— No!As a student,you ________depend on yourself.[ ]
A. shall
B. will
C. can
D. may
Ribozyme核酶
