上颌骨骨折后，骨折块移位的方向最常见的是
A．向后
B．向外
C．向下
D．向前
E．向左右
参考答案：C
解析：主要因为重力作用所致。
_______, Sharon couldn’t find her lost wallet.
A．As she might try
B．Might she as try
C．She might as try
D．Try as she might
新生儿ABO溶血可发生在第一胎，而Rh溶血只发生在第二胎。()
