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【单选题】
如果有毒气体中甲烷和其他毒性较小的烷烃类居多,最适宜的检测仪是()。A.
LEL检测仪
B.
泵吸式检测仪
C.
扩散式检测仪
D.
分体式检测仪
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举一反三
【单选题】The word 'orator' originally meant speaker but now it signifies the person who makes speech. This is an example of ______.
A.
narrowing of meaning
B.
widening of meaning
C.
meaning shift
D.
loss of meaning
【单选题】The sports meet, originally _____ this week, has to be put off because of the bad weather. [ ]
A.
held
B.
holding
C.
having been held
D.
to be held
【单选题】Who originally put forward Cooperative principle?
A.
Herbert Paul Grice
B.
Searle
C.
Austin
D.
James
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