毫秒延期电雷管
参考答案：
通电后以若干秒间隔时间延期爆炸的电雷管为毫秒延期电雷管。
下列陈述中不属于社会合作协议特征的是（）
A.多主体
C.内容广泛
B.由国家强制力来保证实施
D.依靠协议各方的信誉与合作来保障履行
The demand curves faced by monopolistic competitors is:（）
A. inelastic due to the availability of many complementary goods.
B. elastic due to the availability of many close substitutes.
C. flat due to the allocative efficiency of price searcher markets.
