下列泵有做成反转时吸排方向不变的滑油泵的是()。
A.叶片泵
B.螺杆泵
C.齿轮泵
D.柱塞泵
参考答案:C
单采或浓缩血小板的保存最佳温度
A.-30。C,
B.4。C,
C.22。C,
D.37。C,
It was not the cyclist but the driver who ________ for the traffic accident.[ ]
A.was blamed
B.was to blame
C.was to be blamed
D.were to blame