．To deal with the global financial crisis, China ______ the international community to help developing countries．

A．called on

B．called up

C．called in

D．called for

常温水泵、低温水泵启动后不打水的原因有：（）

A.泵内气排净

B.泵后的电磁阀已得电

C.FV01207或FV01233未打开