()直接影响猪的健康和生产力。
A、空气的质量
B、饲料的质量
C、环境的温度
D、管理的水平
参考答案:B
某班民用液化气产量累计为80吨,MTBE原料产量累计为140吨,原料累计量为330吨,此班民用液化气收率为()%。
A、24.24
B、42.42
C、57.14
D、66.66
As I waited for Mike to arrive, I________the clock and saw that he was late. [ ]
A. glanced at
B. stared at
C. watched
D. noticed