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图1是安装在斜屋面上的热水器，图2是安装该热水器的侧面示意图．已知斜屋面的倾斜角为 ，长度为2.1米的真空管AB与水平线AD的夹角为 ，安装热水器的铁架水平管BC长0.2米，求： （1）真空管上端B到AD的距离（结果精确到0.01米）． （2）铁架垂直管CE的长度（结果精确到0.01米）． ( ， )
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举一反三
【单选题】Prevent the company from potential blame from the public.
A.
form A
B.
form B
C.
form C
D.
None of above
【单选题】He was watching her doing it with a ________ look on her face, as if to say that she would not change her mind. [ ]
A.
determining
B.
determined
C.
sceptical
D.
secure
【单选题】When he spoke of death, she had a _____ look on her face.
A.
scary
B.
sacred
C.
scared
D.
secret
【单选题】A company has been formed within the last six months. Another long-established company considers that because of similarity between their names there may be confusion between it and the new company. T...
A.
True
B.
False
【单选题】There was a __________ look on her face when you spoke to her about the question. [ ]
A.
puzzling
B.
puzzled
C.
puzzle
D.
puzzles
【单选题】He was watching her doing it with a ________ look on her face, as if to say that she would not change her mind.
A.
reliable
B.
determined
C.
stubborn
D.
straight
【判断题】To keep the established customer is helpful for the company to prevent its competitors from entering the market.
A.
正确
B.
错误
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