应力开裂
参考答案：
指有些塑料对应力比较敏感，成型时容易产生内应力，质脆易裂，当塑件在外力的作用下或在溶剂的作用下即发生开裂的现象。
The question has been raised at the meeting _____ each member country should equally share the expense
of the committee. [ ]
A. that
B. whether
C. if
D. what
