问题 多项选择题

下列选项中,关于地下防水方案的选定,说法正确的是()

A.对于没有自流排水条件而处于饱和土层或岩层中的工程,可采用防水混凝土自防水结构、钢及铸铁管筒或管片,必要时设置附加防水屋、注浆或其他防水措施

B.对于没有自流排水条件而处于非饱和土层或岩层中的工程,可采用防水混凝土自防水结构、普通混凝土结构或砌体结构,必要时设置附加防水层、注浆或采用其他防水措施

C.对于有自流排水条件的工程,可采用防水混凝土自防水结构、普通混凝土结构、砌体结构或喷锚支护,必要时设置附加防水层、衬套、注浆或采用其他防水措施

D.当地下工程处在振动作用的条件时,应采用硬性防水卷材或防水涂料等防水方案

E.如果工程处在侵蚀性介质中时,应用耐侵蚀的防水砂浆、混凝土、卷材或防水涂料等防水方案

答案

参考答案:A, B, C, E

单项选择题 A1/A2型题
填空题

Press Photographers


Good press photographers must have an "eye" for news, (26) journalists must have a "nose" for a good story. They must be able to interpret a story and decide rapidly how they can take (27) of the best opportunities to take pictures. The most difficult part of a press photographer’s job is that he or she has to be able to (28) a complicated situation with just one photograph. They rarely have second (29) and must be able to take the required (30) very quickly. Indeed, speed is essential — if the photographs are not (31) for the printing deadline, they are very unlikely to be of any (32) .
Most press photographers begin (33) with a local newspaper. There, the (34) is mostly for material of regional interest. Photographers may be expected to photograph a lot of unexciting events but to (35) the enthusiasm to put "something special" into every picture.
There is (36) competition among those who want to move from local to national newspapers. Here, the work is much more centered on news. The photographer must work (37) greater pressure and (38) more responsibility. Only (39) reliable, talented and resourceful photographers (40) this difficult move. The work is tough and can be (41) . On an overseas assignment, photographers may have to (42) unfamiliar food and accommodation, physical and mental stress, and (43) difficulty in transporting the pictures from an isolated area to get them to the newspaper (44) They also have to (45) the competition from other publications.

A. demand B. taskC. obligation D. duty