测井绞车气路的气源取之于（）的储气罐。
A、车辆底盘
B、单独配备
C、电缆喷油装置
D、独立足够气压
参考答案：A
It rained heavily in the south, _____ serious flooding in several provinces.
A．caused
B．having caused
C．causing
D．to cause.
_______ of the heavy burden of homework, the children rushed out of the classroom and enjoyed themselves.
A．To be free
B．Freeing
C．To free
D．Freed
