保证人与商业银行可以就单个主合同分别订立保证合同，也可以}力、商在最高贷款限额内就一定期问连续发生的贷款订立一个保证合同。()
参考答案：对
It also looks at various ways of facilitating the ______ of practical applications beyond the "research tool" stage in satisfying the national needs of earth resource management of developing countries.
A．evolution
B．puncture
C．juncture
D．enforce
DEH系统阀门管理的主要功能有哪些？
