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【单选题】
泵与风机的全效率等于水力效率、容积效率、机械效率的( )。A.
总和
B.
总和的平均
C.
乘积
D.
乘积的平均
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举一反三
【单选题】The cellphone, a device we have lived with for more than a decade, offers a good example of a popular technology's unforeseen side effects. More than one billion are (1)_____ use around the world, and...
A.
of
B.
for
C.
in
D.
by
【单选题】Which seems to be most significant in telling time to people of pre-industrial societies?
A.
Clock-work.
B.
The sun and the moon.
C.
Unpunctuality.
D.
Changes of season.
【简答题】形成良好班集体的重要标志是( )。 A.核心队伍 B.班级秩序 C.舆论班风 D.组织活动
【单选题】. Nowadays people attach importance _______ the children’s pre-school education.
A.
to
B.
in
C.
of
D.
about
【单选题】To prevent or delay a diabetes diagnosis, people with pre-diabetes should pay most attention to______.
A.
glucose levels
B.
exercises
C.
heart disease
D.
stroke
【单选题】If you copy the online information onto your PC device, you will ______ .
A.
save the time of connecting to the online system
B.
reduce the risk of losing information
C.
pay just local telephone charges
D.
get local information only
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