磁粉探伤不能确定缺陷深度。
参考答案：对
5.4÷11的商是______，用循环小数的简便记法是______，它是______循环小数，保留两位小数是______，精确到千分位是______．
Because he works in a remote area, he visits his parents only ______.
A．occasionally
B．partly
C．practically
D．once
