夹具按对零部件的紧固方式可分为()。
A.夹紧、拉紧、压紧、涨紧四种
B.夹紧、压紧、顶紧、涨紧四种
C.夹紧、压紧、拉紧、顶紧四种
D.夹紧、拉紧、顶紧、涨紧四种
参考答案:C
Some foreign cartoons for children have been banned on the ________ that they are too violent.
A.proof
B.analysis
C.opinion
D.basis
以下哪个药物不是特效金属解毒剂().
A.二巯基丙醇
B.二巯丁二酸
C.依地酸钙钠
D.硫代硫酸钠
E.青霉胺