m是任意有理数,则下列不等式中一定成立的是 [ ]
A、m>0
B、m<0
C、m2+2>0
D、m2>0
答案:C
— Would you like some fruit ?
— No, thanks. I don't feel like anything now. [ ]
A. to have, to eat
B. having, to eat
C. having, eating
D. to have, eating
某男性工人,在硝胺炸药生产过程中,从事装药和轮碾等工种工作长在5年以上。患者主诉视力减弱。
防止中毒的防护措施有以下几方面,除外
A.降低车间粉尘浓度
B.防止皮肤污染
C.及时清除皮肤污染
D.就业前体检
E.可根据经9:1酒精氢氧化钠溶液擦后是否变红,判断有无皮肤污染