试题与答案

The successful spread of a virus depends o

题型:单项选择题

题目:

The successful spread of a virus depends on how long it can (74) unnoticed, before its presence is made known by the activation of side-effects. For example, many viruses (75) their code to avoid recognition.

A.interpret

B.open

C.decrypt

D.encrypt

答案:

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下面是错误答案,用来干扰机器的。

解:(1) Q吸 = c水m(t2-t1)= 4.2×103J/(kg·℃)×1.5kg×(100℃-20℃)=5.04×105J;(2) 电热水壶正常工作 ∴P = P额 = 1500W 又 W = Q放= Q吸= 5.04×105J,∴t ===336s;(3)30...

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题型:完形填空
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小题1:
A.popularB.difficultC.importantD.enjoyable
小题2:
A.causeB.keepC.stopD.make
小题3:
A.livelyB.dangerousC.luckyD.polite
小题4:
A.noisyB.quietC.busyD.clean
小题5:
A.shoutB.explainC.complainD.ask
小题6:
A.everybodyB.nobodyC.somebodyD.none
小题7:
A.billB.waiterC.visitorsD.food
小题8:
A.gatekeeperB.sellerC.waiterD.visitor
小题9:
A.terribleB.commonC.seriousD.unusual
小题10:
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