()that there is anotherfootball match on the air this evening.
A. It says
B. It was said
C. It is said
D. What was said
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All the people always get humour in the same way.
A. 对
B. 错
What is funny in one culture might not be funny in another culture.
A. 对
B. 错
0.4 mol H2SO4溶解于水,配成500 mL溶液,其浓度表示正确的是
A. c (H2SO4) = 0.8 mol·L-1
B. c[1/2(H2SO4)] = 0.8 mol·L-1
C. c[1/2 (H2SO4) ]= 0.4 mol·L-1
D. 硫酸的浓度为0.8 mol·L-1
500mL蔗糖水溶液含有蔗糖25g,该蔗糖的质量浓度为
A. 5.0 % (g/mL)
B. 0.050 g/L
C. 0.05
D. 5.0%
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