申请考试员资格的人员，应当参加不少于（）的考前培训和专业技能考试。 ["30学时","40学时","50学时","60学时"]
对碳酸锂血浓度进行检测时，要求在末次服药后多少时间抽血较佳（） ["8小时","12小时","16小时","24小时","2天"]
While I was in the university, I learned taking a photo,（）is very useful now for me. ["it","which","that","what"]
ZXM10 ETN最大可提供（）路E1接口和（）路以太网接口，实现E1线路与以太网间的对接互联。 ["8；16","8；8","16；8","16；16"]
下列哪个图形适合描述顺序数据（）。 ["直方图","茎叶图","累积频数分布图","箱线图"]
为了提高移动通信的信号质量，通常采用分集接收技术，常见的分集技术有：（）、空间分集、频率分集。
