滤线栅铅条高度与其间隔距离的比称为 ()
A.栅比
B.栅密度
C.铅容积
D.栅焦距
E.滤线因数
参考答案:A
2012年的太空好戏连台,流星雨、超级月亮、日环食……,你方唱罢我登场。对这些天文奇观,科学家们都做出了较为精确的预测,这是因为( )
①思维和存在具有同一性 ②意识活动具有目的性和计划性
③意识对改造客观世界具有指导作用 ④人的意识能够把握事物的本质和规律
A.①②
B.②④
C.①④
D.②③
Soon, more of the information we receive via the Internet could come (31) in digital wrappers.
Wrappers are made up (32) software code that’s targeted to do specific things with the data (33) within them, such as helping to define queries for search engines. They also keep (34) from (35) access to that code.
35()
A.gain
B.gained
C.gains
D.gaining