致畸原是指()
A.能使遗传物质发生突变的物质
B.能使胎儿生长迟缓的化学物质
C.能使子代出生后具有畸形的化合物
D.能使胚胎死亡的化合物
E.能产生母体毒性的物质
参考答案:C
125. Unable to practise their traditions, many young Romans _______ illegal behavior, such as stealing, and were usually the main suspects when anything went missing.
A.took in
B.took on
C.took up
D.took to
单孔的(),以控制尺寸精度为主,采用固定尺寸双刀刃镗刀装在有中心定位的刀杆方孔内进行镗削加工。
A.粗镗
B.半精镗
C.精镗
D.组合镗