与十进制数87和25.7等值的二进制数（要求二进制数保留小数点以后4位有效数字）分别为（             ）。

The______ is responsible for taking the emergency calls...

单项选择题The______ is responsible for taking the emergency calls and sending out paramedics. A.
patient B.
docotr C.
dispatcher D.
nurse

The goal of staff training is to enhance employee quali...

单项选择题The goal of staff training is to enhance employee quality, improve productivity and meet future needs of the ______.

用铝热焊时，插入短轨长度等于切除钢轨长度加上2倍预留焊缝值。

判断题用铝热焊时，插入短轨长度等于切除钢轨长度加上2倍预留焊缝值。