【单选题】可控式U形管被动减摇水舱与不可控式U形管被动减摇水舱在结构上的主要区别在于()。 a.封闭的U形管; b.能自动调节两个封闭水舱间空气连通管上的阀门; c.通过水泵强迫水舱内的水流动,可在水量有限的情况下获得较大的减摇能力。
【单选题】听力原文:Now, text messaging is increasingly being used by UK hospitals to remind patients about outpatient appointments—and could potentially save the National Health Service millions of pounds every yea...
【单选题】There is an ongoing debate about the potentially harmful effects ________ text messaging can have on people's grammar.
【判断题】电热温床铺设时,如果电热线不够用可以将其接长或减短使用。
【单选题】An (71) service bus (ESB) acts as a shared messaging layer for connecting applications and other services throughout an enterprise computing infrastructure. It supplements its core (72) messaging back...
【单选题】What has been done about text messaging?
A.
Evidence is now being collected to fight against text messaging.
B.
Bus drivers and train drivers are forbidden to text messages.
C.
Some laws about text messaging have been put into effect in America.
D.
Some actions have been applied to solve the trouble caused by text messaging.