We wish to inform you that our sales volume has been () for three successive years. All of the following can be used except:
A. risen
B. on the increase
C. going up
D. on the rise
下列关于PC机互联网接入技术的几种叙述: ①拨号接入是基于铜质双胶线作为传输介质的接入方法 ②ISDN接入是基于光纤作为传输介质的接入方法 ③ADSL接入是基于同轴电缆作为传输介质的接入方法 ④有线电视网接入是基于光纤和同轴电缆作为传输介质的接入方法其中正确的是( )
A. ①和②
B. ②和③
C. ③和④
D. ①和④
DVD-ROM的速度计算方法与CD-ROM不同,前者的速度单位(速度基准)是后者的9倍,所以DVD-ROM的一倍速应为
A. 600KB/s
B. 900KB/s
C. 1350KB/s
D. 2250KB/s
We are pleased to confirm () your Order No. ST301 for sulphuric acid.
A. to accept
B. accepting
C. having accepted
D. acceptance