位置区交界带可能出现问题及解决手段。
参考答案：
位置更新频繁；CRH、CI、C2
Tom had prepared carefully for his driving test so that he could be sure of passing it on his first .
A．attention
B．expectation
C．attempt
D．desire
Ⅱ等粘土砖的耐火度不小于1730℃。（）
