可用高锰酸钾液洗胃的物质中毒是
A．氯丙嗪
B．氟乙酰胺
C．水合氯醛
D．甲拌磷
E．对硫磷
参考答案：B
She has already tried her beShe has already tried her best. Please don't be too ________ about her
job．[ ]
A. special
B. responsible
C. unusual
D. particularst
一般当工件的强度、硬度、塑性越高时，刀具耐用度（）
A、不变
B、有时高，有时低
C、越高
D、越低
