要确定事态演变的明确结果,并不容易.It is not easy to establish the exact sequence of events.他论证说,生物是由于一些小的遗传变异的积累而逐渐演变的.He argued that organisms evolve gradually by accumulating small hereditary changes.每项发展都是而且将来也是逐渐演变的.Each development...
After the 1960 s, China began to inoculate BCG, pertussis, diphtheria, tetanus, measles and poliomyelitis vaccines.六十年代后, 中国开始在大、中城市接种卡介苗 、 百日咳 、 白喉 、 破伤风 、 麻疹、脊髓灰质炎的疫苗的工作.Recombinant BCG vaccine is a new type of vaccine...
The eye is a complex and highly developed photosensitive organ.眼是复杂而且高度精密的感光器官.It is the good stabilizer of photosensitive resin, sensitive emulsion, synthetic resin.是光敏树脂 、 感光乳剂 、 合成树脂的良好稳定剂.Whirler: Machine which appli...
这种重要的碳化物向晶体内和晶体间沉淀.This important carbide precipitates both inter and intragranularly.Fe -Cr-C 耐磨堆焊合金中初生碳化物生长方向的控制.Orientation control of primary carbide in Fe - Cr - C hardfacing alloys.提出了避免碳化物带状偏析的有效措施.The effective m...