注塑成型时，塑料处于（）状态。
A.玻璃态
B.高弹态
C.粘流态
D.气化态
参考答案：C
The family were holidaying in the country _______ the rain poured down.
A．when
B．as
C．while
D．since
货运列车脱轨2辆以上4辆以下，构成一般（）类事故。
