()润滑脂耐水性好,耐热能力差,适用于工作温度不高于60℃的开式与空气、水气接触的摩擦部位上。
A、钙基
B、钠基
C、锂基
参考答案:A
Tina was hesitation about the job offer as she did not know _______ the company was an established one.
A.whether
B.what
C.until
D.although
一血友病男性患者的正常女儿与一正常男性结婚,预计所生的第一和第二个小孩都患血友病的概率为______。