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【多选题】
(1)22.关于在混凝土中掺入减水剂所起的作用,正确的是( )A.
若不减少拌合用水量,能显著提高拌合物的流动性
B.
当减不减少水泥时,可提高混凝土强度
C.
若减水的同时适当减少水泥用量,则可节约水泥
D.
混凝土的耐久性得到显著改善
E.
混凝土的安全性得到显著提高
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举一反三
【单选题】When his daughter Mary went out for her evening walk Doctor Cochran sat for an hour alone m his office. It began to grow dark and the man who all afternoon had been sitting on chairs and boxes before ...
A.
had intended to go for a walk with Mary
B.
had to fight with acute depression
C.
liked to grow his beard in purpose
D.
was suffering from a fatal disease
【单选题】Mary sat at the table, looked at the glare and ______ her lips.
A.
smacked
B.
opened
C.
parted
D.
separated
【单选题】Mary sat at that table, looked at the plate and _________ her lips.
A.
smacked
B.
opened
C.
parted
D.
separated
【单选题】Mary sat at the table, looked at the plate and ______her lips.
A.
smacked
B.
opened
C.
parted
D.
seperated
【简答题】Mary sat on the sofa, (watch) TV.
【单选题】When I entered the room, I found Mary ______ at the desk ______ her homework.
A.
sat; doing
B.
sitting; to do
C.
seating; to do
D.
seated; doing
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