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【单选题】
保温层材料的选择在保温材料的物理、化学性能满足工艺要求的前提下，应优先选用（ ）的保温材料。A.
导热系数低、密度小，价格低廉、施工方便、便于维护
B.
导热系数高、密度小，价格低廉、施工方便、便于维护
C.
导热系数低、密度大，价格低廉、施工方便、便于维护
D.
导热系数高、密度大，价格低廉、施工方便、便于维护
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举一反三
【单选题】If two pair-elements of a kinematic pair have surface contact or its equivalent, the kinematic pair is known as a ( ).
A.
higher pair
B.
gear pair
C.
lower pair
D.
cam pair
【单选题】If two pair-elements of a kinematic pair have surface contact or its equivalent, the kinematic pair is known as a ( ).
A.
higher pair
B.
lower pair
C.
gear pair
D.
cam pair
【单选题】The writer mentions______as a pair to indicate that people should have moderate feelings of guilt.
A.
eccentric people and fashionable people
B.
overanxious people and less sociable people
C.
sociable people and healthy people
D.
reserved people and radical people
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