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【单选题】
离心泵与往复泵相比，其主要缺点是（）A.
流量不均匀
B.
自吸能力差
C.
不能抽送含杂质的污水
D.
管理维修较麻烦
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举一反三
【单选题】The author mainly describes ______ in the article.
A.
the creation of glaciers
B.
the classification of glaciers
C.
the features of glaciers
D.
what glaciers are
【单选题】It is taken as a great contribution made by _____ that languages in the world are classified into different language families according to their genetic relations.
A.
modern linguists
B.
traditional grammarians
C.
sociolinguists
D.
historical linguists
【单选题】According to Philips, which of the following is INCORRECT?
A.
The rejections can be classified as form. rejection and positive rejection.
B.
There's no signature or a rubber-stamp signature in a Form. Rejection.
C.
A Form. Rejection is depressing while a Positive Rejection is inspiring.
D.
A Form. Rejection refers to a letter of which the editor won't read any word.
【单选题】Opoids are drugs______.
A.
made from natural plants
B.
that will result in addiction
C.
classified as dangerous
D.
used for pain-easing
【单选题】The Tourist Bureau ______ everything for our journey.
A.
sorts
B.
arranges
C.
prepares
D.
classifies
【单选题】In our school students are _____ according to how much they know and how old they are. [ ]
A.
classified
B.
combined
C.
condemned
D.
betrayed
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