胎儿期保健，我国古代称之为“养胎护胎”、“胎养胎教”。
参考答案：对
In front of our house ________ we used to swim.
A．a river lies that
B．does a river lie where
C．lies a river which
D．lies a river where
造成主轴轴向窜动的主要原因是主轴轴颈和轴承的圆度误差。
