A. cross connection line between two main fire lines B. special wrench for tightening couplings in a fire hose line C. tackle rigged to support a fire hose D. None of the above
A. 要式合同与不要式合同 B. 有偿合同与无偿合同 C. 诺成合同与实践合同 D. 双务合同与单务合同
A. 1 B. 1.5 C. 2 D. 2.5