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【判断题】
( )磁路欧姆定律适用于只有一种媒介质的磁路。A.
正确
B.
错误
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举一反三
【单选题】You should turn off all the water tonight ______ water freezes and the pipes burst.
A.
in some cases
B.
in case
C.
in that case
D.
in any case
【单选题】Bamboo（竹子）is made ______ pipes（管道）______ carrying water______ some farmers in the countryside.
A.
by; for; into
B.
for; by; into
C.
into; for ; by
【单选题】Large pipes or _____ are fitted between the steam and water drums to ensure good natural circulation of water.
A.
fire-tubes
B.
furnaces
C.
down-comers
D.
soot-blowers
【简答题】The city water pipes in Rome were usually of baked clay or lead copper was sometimes used and also hollowed stone. For the large supply conduits leading to the city the Romans used covered channels wi...
【简答题】water pipes
【单选题】In such freezing weather,water pipes are easy to and water will escape from the . [ ]
A.
break;break
B.
crack;burst
C.
burst;crack
D.
break;burst
【单选题】Water expands ______ freezing, as can be deduced from occasional breaks in water pipes in severe winters.
A.
on
B.
during
C.
with
D.
against
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