国家标准规定,硅酸盐水泥的初凝时间不得短于45min,终凝时间不得长于()h。
A. 5.0
B. 6.5
C. 8.5
D. 10
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In my opinion, she left the letter there ______ so that you'd see it.
A. technically
B. eagerly
C. normally
D. deliberately
As a policeman, Mr. Brown thought that he had a duty to ______ the lost children in finding their homes.
A. assist
B. help
C. provide
D. support
The ______ on his face told me that he was angry.
A. impression
B. sight
C. appearance
D. expression
From all points of view, war would be a ______ to the people.
A. solution
B. catastrophe
C. triumph
D. failure