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【单选题】
使用化学杀虫法时,应注意选择害虫的生理形态,其最佳施药期是()。 A. 卵A.
幼虫
B.
成虫
C.
蛹
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举一反三
【单选题】If no gaskets are used in the piping joints of a Freon system, the joints must be（）
A.
finished joints
B.
welded joints
C.
ground joints
D.
soldered joints
【单选题】According to the article, why should building joints be agile?
A.
Such joints are cheap.
B.
Such joints make buildings flexible and moveable.
C.
Such joints are concrete frames.
D.
Such joints make the buildings rigid.
【单选题】U-joints in the shaft accommodate any angular variations between the steering shaft and the______ .
A.
reservoir
B.
drag link
C.
pitman arm
D.
steering gear input shaft
【单选题】The metatarsophalangeal joints are which type of synovial joints?
A.
saddle joints
B.
hinge joints
C.
condyloid joints
D.
pivot joints
E.
spheroidal joints
【多选题】Which belong to the joints of the vertebral arch ( )
A.
Ligamenta flava
B.
Interspinal ligaments
C.
Intertransverse ligaments
D.
Intervertebral disc
E.
Zygapophysial joints
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