The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air. ["because","though","since","until"]
The court has the power to（）the time for commencing arbitration proceedings if it is of the opinion that in the circumstances of the case undue hardship would otherwise be caused. ["pretend","extend","contend","intend"]
为什么对淡水产鱼资源要尽可能进行综合加工利用？
固定偏置单管电压放大电路，改变基极电阻RB阻值的作用是（） ["改变电压放大倍数","改变电流放大倍数","稳定静态工作点","改变静态值，改善放大器的非线性失真"]
企业要控制信用风险，管好用好应收账款，必须事先指定合理的信用政策，这主要包括（）、信用标准、信用额度等方面。 ["信用目标","信用证","信用条件","信用期限"]
原始状态的教育特征是什么？
