问题
多项选择题
（）和其他需要考虑检修的设备进出口管道上都应设阀门。
A.水加热器、热水贮水器
B.循环水泵
C.自动排气阀
D.自动温度调节器
答案
参考答案：A, B, C, D
搜题请搜索小程序“爱下问搜题”
（）和其他需要考虑检修的设备进出口管道上都应设阀门。
A.水加热器、热水贮水器
B.循环水泵
C.自动排气阀
D.自动温度调节器
参考答案：A, B, C, D
| Artificial flowers are used for scientific as Well as for decorative purposes. They are made from (51) of materials, such as wax and glass, so skillfully that they can scarcely be (52) from natural flowers. In making such models, painstaking skill and artistry are called for, (53) thorough knowledge of plant structure. The (54) of glass flowers in the Botanical Museum of Harvard University is the most famous in North America and is widely known (55) the scientific world. (56) , there are several thousand models in colored glass, the work of two artist naturalists, Leopold Blalschka and his son Rudolph. The intention was to have the collection (57) at least one member of each flower family native to the United States. (58) it was never completed, it contains more than seven hundred species representing 164 families of flowering plants. (59) detail of these is accurately reproduced in color and structure. The models are (60) n locked cases as they are too valuable and fragile for classroom use. |
A．through
B．throughout
C．over
D．on