无效劳动合同自( )起，就不具备法律效力。
A．履行劳动合同之 B．订立的时候C．确认劳动合同无效之日 D．发现劳动合同无效之日
参考答案：B
—They is an look on his face. What for?
—Because he heard the news about his students just now.[ ]
A. excited; exciting
B. exciting; excited
C. excited; excited
D. exciting; exciting
制备溶蚀性骨架片（）
A．聚乙烯醇
B．大豆磷脂
C．单硬脂酸甘油酯
D．无毒聚氯乙烯
E．丙烯酸树脂Ⅳ号
