Sixty percent of the work _____?
B.had been done
C.has been done
D.has done
B.had been done
C.has been done
D.has done
第1题
A. for
B. on
C. to
D. with
第3题
A.by 18 percent
B.to 18 percent
C.at 18 percent
D.for 18 percent
第4题
A.delicious
B.perfect
C.delicate
D.percent
第6题
34 percent with diameter 10μ. We now pass thisstream through a cyclone whose efficiency is described by, withDCUT=5μ. What fraction by weight of the particles will the cyclone collect?
第7题
Calculate the percent ionization in a 0.20 mol·L-1solution of hydrofluoric acid, HF()。
第8题
The food price ______ by 10 percent during holiday.
A.raise
B.rose
C.arose
D.aroused
第9题
Don't promise anything______you are 100 percent sure.
A.if
B.since
C.unless
D.because
第10题
Calculate the hydroxide ion concentration,the percent reaction,and the pH of a 0.050mol·L-1solution of sodium acetate. (For acetic acid,).