高压齿轮泵采用间隙自动补偿结构是为了______。
A、消除困油B
暂无解析
垄断资本主义产生并占统治地位是()
Manyothernewtechniquesarenowavailablethatenablemoreresearch___(do)inthetesttubetoseeifchemicalsproduceharmfulbiologicaleffects.
Idon’tneedanyhelpatthemoment,butI_____youroffer
商品生产过程中创造商品价值的劳动是()
Thisscientistwasawardedwithseveraltitlesforhis________(accomplish)inbiology
