原生质体起始材料的特性和生理状态是决定原生质体质量的重要因素之一。
参考答案：对
The problem referred to at the class meeting, if ______________ in time, will make a bad effect on everyone in our class.
A．not dealt with
B．not to deal with
C．not being dealt with
D．not dealing with
混凝土结构和预应力混凝土结构应用的钢筋有( )。
A．普通钢筋
B．预应力钢绞线
C．钢丝
D．光圆钢筋
E．热处理钢筋
