二级保养离心泵时用特制的拉力器取下(),检查磨损情况。
A、平衡环
B、轴套
C、平衡盘
D、挡套
参考答案:C
—I’ve read another book this week.
—Well, maybe _______ is not how much you read but what you read that is important.
A.this
B.that
C.there
D.it
能测定蛋白质分子量的电泳技术是
A.醋酸纤维薄膜电泳
B.琼脂糖凝胶电泳
C.火箭免疫电泳
D.免疫固定电泳
E.SDS-PAGE