下载APP
举一反三
【单选题】New Technique Promises Earlier Cancer Detection A new technique could revolutionize the early detection of cancer, giving sufferers a greater chance of beating the disease, American scientists said. R...
A.
before
B.
after
C.
although
D.
near
【多选题】电视监控系统中的监视器的操作使用应该()。
A.
监视器应安装在固定的机架或机柜上
B.
安装在机柜中,应有通风散热的措施
C.
安装在机柜中,应注意电磁屏蔽
D.
监视器的安装位置应使屏幕不受外来光线的干扰