车床（）等重要润滑部位采用油泵输油润滑。
A．光杠
B．丝杠
C．主轴后轴承
D．主轴前轴承
参考答案：D
—Did you have breakfast this morning?
—No, I got up late and went to school ______ breakfast. [ ]
A. for
B. in
C. without
D. after
为了减轻或延缓糖尿病血管并发症的发生常首选（）
A.甲苯磺丁脲
B.氯磺丙腺
C.格列齐特
D.格列喹酮
E.格列本脲
