高含硫油气井是指地层天然气中硫化氢含量高于()的井。
A.10ppm
B.100ppm
C.20ppm
D.30ppm
参考答案:A
It ________________the job yesterday.
A.took me two hours to finish.
B.cost me two hours to finish
C.spent me two hours finishing
D.took me two hours finishing
安慰剂