阀门手轮为红色，表明密封面材料为（）或（）；阀门手轮为浅兰色，表明密封面材料为（）或（）。
参考答案：青铜；黄铜；耐酸钢；不锈钢
—Could you please tell me how to get on well with my schoolmates?
—________
A．Try to be confident and work hard.
B．Be helpful and friendly.
C．Choose the white dress. You look nice in white.
D．You should have a lot of money.
骨盆入口呈卵圆形，入口前后径较横径长，骶坐切迹较宽，坐骨棘较突出，耻骨弓较窄
A．圆韧带B．阔韧带C．主韧带D．宫骶韧带E．骨盆漏斗韧带
