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【单选题】
在普通轻型单吊杆受力分析中，吊杆自重G估算的依据是（） ①G/2作用在千斤索（吊杆头部）上； ②G/2作用在桅柱（吊杆承座）上； ③一半作用在稳索上。A.
①②
B.
②③
C.
①③
D.
①②③
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【单选题】Everywhere man has cut down __________ forests in order to grow crops, or to use __________ wood as fuel or as building material.
A.
the; the
B.
the; 不填
C.
不填; the
D.
不填; 不填
【简答题】如何正确选用 火花塞? 如何正确选用 火花塞?
【简答题】如何正确选用 火花塞?
【单选题】In order to repair barns, build fence, grow crops, and care for animals a farmer must indeed be___.
A.
restless
B.
skilled
C.
strong
D.
versatile
【单选题】In order to repair barns, build fences, and grow crops a farmer should be__________.
A.
bizarre
B.
fantastic
C.
versatile
D.
reckless
【单选题】In order to repair barns, build fences, grow crops, and care for animals a farmer must indeed be______.
A.
restless
B.
skilled
C.
strong
D.
versatile
【单选题】In order to grow well, the Blue Sprace, like other pine trees, ______ a temperate climate.
A.
require
B.
requires
C.
is required
D.
that requires
【简答题】简述电子商务企业降低物流成本的途径与措施。
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