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【单选题】
下述热水供应系统和管道直饮水系统管材的选择中，哪项不符合要求A.
管道直饮水系统应优选薄壁不锈钢管
B.
热水供应系统应优选薄壁不锈钢管
C.
定时供应热水系统应优选塑料热水管
D.
开水管道用许可工作温度大于100℃的金属管
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举一反三
【单选题】The light in the room wasn’t _______for me to read.
A.
enough bright
B.
brightly enough
C.
enough brightly
D.
bright enough
【单选题】某一核酸分子,碱基中有52%为A,该核酸分子是
A.
DNA分子
B.
单链DNA分子或RNA分子
C.
DNA与RNA形成的杂化双链
D.
双链DNA分子或RNA分子
E.
各选项均有可能
【单选题】In a study of the effect of color on productivity, 50 of 100 factory workers were moved from their drab workroom to a brightly colored workroom. Both these workers and the 50 who remained in the drab ...
A.
The 50 workers moved to the brightly colored room performed precisely the same manufacturing task as the workers who remained in the drab workroom.
B.
The drab workroom was designed to provide adequate space for at most 65 workers.
C.
The 50 workers who moved to the brightly colored workroom were matched as closely as possible in age and level of training to the 50 workers who remained in the drab workroom.
D.
Nearly all the workers in both groups had volunteered to move to the brightly colored workroom.
E.
Many of the workers who moved to the brightly colored workroom reported that they liked the drab workroom as well as or better than they liked the brightly colored workroom.
相关题目：
【单选题】某一核酸分子,碱基中有52%为A,该核酸分子是
A.
DNA分子
B.
单链DNA分子或RNA分子
C.
DNA与RNA形成的杂化双链
D.
双链DNA分子或RNA分子
E.
各选项均有可能
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