泵用封油的作用为()、()、冷却、冲洗。
参考答案:密封;润滑
She is worried about her final exams her illness.
A.unless
B.even though
C.because
D.because of
肾功能不好的老年糖尿病患者首选
A.格列喹酮
B.格列齐特
C.格列吡嗪
D.格列苯脲
E.甲苯磺丁脲