简述合作的类型。
参考答案：
①.自发性合作，最古老和最具普遍意义的合作形式；
②.制度化的传统合作；
③.指导性合作；
④.契约式合作
—I should have spent more time on English, otherwise I wouldn’t have failed in the exam.
—You are right .
A．Where there is a will, there is a way.
B．One without wisdom is more misfortune than without money.
C．No pains, no gains.
D．Goals determine what you are going to be.
对绞电缆
