属于国家二级保护野生药材物种的是
A．赛加羚羊B．甘草C．龙胆D．洋金花E．罂粟
参考答案：B
--- Jim took one-hour ride just now. What a short time he spent finishing such a long way!
--- He is _____ experienced rider.
A．an; the
B．an; a
C．a ;an
D．a; the
托辊以1450r/min转速转200小时后，煤尘进入轴承润滑脂含量不得超过（）。
A、0.5％
B、0.8％
C、1％
D、0.7%
