文献：Guiding of terawatt laser pulses in preformed plasma channels. Nikitin, Sergei Petrovich (Univ. of Maryland, College Park, MD, USA). 160 pp. Avail. UMI, Order No. DA9925820 From: Diss. Abstr. Int., B 1999, 60(4), 1682 (English) 1999.以下说明正确的是：
举一反三
- 文献：Guidingofterawattlaserpulsesinpreformedplasmachannels.Nikitin,SergeiPetrovich(Univ.ofMaryland,CollegePark,MD,USA). 160pp. Avail.UMI,OrderNo.DA9925820 From:Diss.Abstr.Int.,B1999,60(4),1682(English)1999.以下说明正确的是：
- -1/1999的5次方×-1999的4次方
- 设有一结构体类型变量定义如下,若对结构体变量w1的出生年份进行赋值,下面正确的赋值语句是( )struct date{int year;int month;int day;};struct worker{char name[20];char sex;struct date birthday;}w1; A: year=1999 B: Birthday.year=1999 C: w1.year=1999 D: w1.birthday.year=1999
- Attach the track to the channels with the ____. A: Attach the track to the channels with the bolts. B: Bolt track to channels.
- 查询学生成绩，将成绩首先按英语，然后按数学从高到低排序，正确的语句是（ ）。 A: select * from score order by english asc,maths asc B: select * from score order by english desc,maths desc C: select * from score order by maths,english D: select * from score order by english,maths