In Japan, loudly slurping a soup is considered as ________.
A. Rude and obnoxious
B. A sign that you like the soup
C. Normal at home but not in public
D. Something only foreigners do
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In Brazil, it is considered normal to show up for a social event ________.
A. Ten to fifteen minutes early
B. Ten to fifteen minutes late
C. Fifteen minutes to an hour late
D. One to two hours late.
( )必须选用水硬性胶凝材料。
A. 干燥环境下
B. 潮湿环境中
C. 寒冷环境下
D. 高温环境下
胶凝材料按成分可分为____胶凝材料、____胶凝材料。
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