他听见低沉的心跳声，跳动的速度却更快了。He heard his heart thump dully but more quickly.我的一生是随着祖国的脉搏而跳动的.My life pulsates with every movment of my country.他的激烈跳动的心简直随时都要跳出来.His dancing heart was ready to jump from his body....
All our products are met GB or manufacturer standard.产品质量均符合GB标准及公司标准.The instrument conforms to the standards ISO, GB, AATCC.仪器性能符合GB 、 ISO 、 AATCC等 标准对测试的要求.What's the difference in Stainless steer classification ...
Semiconductors containing such impurities are called p - type semiconductors.含有这类杂质的半导体叫做P型半导体.It is not possible to name any particular conductivity at which metals end and semiconductors begin.不可能说出在哪个特定的导电系数处是金属和半导体的分...