[问答题] 应答器地面设备接口有哪些？

Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from（）. ["the customs","the Register Bureau of shipping","the shipyard fire department","a certified gas chemist"] 若谐振功率放大器原来工作在临界状态，只增加Vcc，其它电路参数不变，则放大器工作状态将如何变化？ 在其他条件适宜而温度偏低的情况下，如果提高温度，光合作用的C02补偿点、光补偿点和光饱和点（）。 ["均上升","均下降","不变化","变化无规律"] At the same time，it is（）for you to signify your acknowledgement of the responsibility for the collision by signing the copies of this letter hereto attached and to return me two copies in due time. ["essential","important","good","a better operatio"] 下列关于C4植物光合作用的说法，错误的是（）。 ["3-磷酸甘油醛是CO_{2<\/sub>固定的第一产物","四碳酸是由维管束鞘细胞中的磷酸烯醇式丙酮酸羧化酶作用形成的","比C3<\/sub>植物有持续较低的CO2<\/sub>水平","双磷酸核酮糖释放的CO2<\/sub>转移给磷酸烯醇式丙酮酸（PEP）"] 应答器地面设备接口有哪些？}